MAYBE

Problem:
 active(dbl(0())) -> mark(0())
 active(dbl(s(X))) -> mark(s(s(dbl(X))))
 active(dbls(nil())) -> mark(nil())
 active(dbls(cons(X,Y))) -> mark(cons(dbl(X),dbls(Y)))
 active(sel(0(),cons(X,Y))) -> mark(X)
 active(sel(s(X),cons(Y,Z))) -> mark(sel(X,Z))
 active(indx(nil(),X)) -> mark(nil())
 active(indx(cons(X,Y),Z)) -> mark(cons(sel(X,Z),indx(Y,Z)))
 active(from(X)) -> mark(cons(X,from(s(X))))
 mark(dbl(X)) -> active(dbl(mark(X)))
 mark(0()) -> active(0())
 mark(s(X)) -> active(s(X))
 mark(dbls(X)) -> active(dbls(mark(X)))
 mark(nil()) -> active(nil())
 mark(cons(X1,X2)) -> active(cons(X1,X2))
 mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
 mark(indx(X1,X2)) -> active(indx(mark(X1),X2))
 mark(from(X)) -> active(from(X))
 dbl(mark(X)) -> dbl(X)
 dbl(active(X)) -> dbl(X)
 s(mark(X)) -> s(X)
 s(active(X)) -> s(X)
 dbls(mark(X)) -> dbls(X)
 dbls(active(X)) -> dbls(X)
 cons(mark(X1),X2) -> cons(X1,X2)
 cons(X1,mark(X2)) -> cons(X1,X2)
 cons(active(X1),X2) -> cons(X1,X2)
 cons(X1,active(X2)) -> cons(X1,X2)
 sel(mark(X1),X2) -> sel(X1,X2)
 sel(X1,mark(X2)) -> sel(X1,X2)
 sel(active(X1),X2) -> sel(X1,X2)
 sel(X1,active(X2)) -> sel(X1,X2)
 indx(mark(X1),X2) -> indx(X1,X2)
 indx(X1,mark(X2)) -> indx(X1,X2)
 indx(active(X1),X2) -> indx(X1,X2)
 indx(X1,active(X2)) -> indx(X1,X2)
 from(mark(X)) -> from(X)
 from(active(X)) -> from(X)

Proof:
 DP Processor:
  DPs:
   active#(dbl(0())) -> mark#(0())
   active#(dbl(s(X))) -> dbl#(X)
   active#(dbl(s(X))) -> s#(dbl(X))
   active#(dbl(s(X))) -> s#(s(dbl(X)))
   active#(dbl(s(X))) -> mark#(s(s(dbl(X))))
   active#(dbls(nil())) -> mark#(nil())
   active#(dbls(cons(X,Y))) -> dbls#(Y)
   active#(dbls(cons(X,Y))) -> dbl#(X)
   active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y))
   active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y)))
   active#(sel(0(),cons(X,Y))) -> mark#(X)
   active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z)
   active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z))
   active#(indx(nil(),X)) -> mark#(nil())
   active#(indx(cons(X,Y),Z)) -> indx#(Y,Z)
   active#(indx(cons(X,Y),Z)) -> sel#(X,Z)
   active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z))
   active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z)))
   active#(from(X)) -> s#(X)
   active#(from(X)) -> from#(s(X))
   active#(from(X)) -> cons#(X,from(s(X)))
   active#(from(X)) -> mark#(cons(X,from(s(X))))
   mark#(dbl(X)) -> mark#(X)
   mark#(dbl(X)) -> dbl#(mark(X))
   mark#(dbl(X)) -> active#(dbl(mark(X)))
   mark#(0()) -> active#(0())
   mark#(s(X)) -> active#(s(X))
   mark#(dbls(X)) -> mark#(X)
   mark#(dbls(X)) -> dbls#(mark(X))
   mark#(dbls(X)) -> active#(dbls(mark(X)))
   mark#(nil()) -> active#(nil())
   mark#(cons(X1,X2)) -> active#(cons(X1,X2))
   mark#(sel(X1,X2)) -> mark#(X2)
   mark#(sel(X1,X2)) -> mark#(X1)
   mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
   mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
   mark#(indx(X1,X2)) -> mark#(X1)
   mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
   mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
   mark#(from(X)) -> active#(from(X))
   dbl#(mark(X)) -> dbl#(X)
   dbl#(active(X)) -> dbl#(X)
   s#(mark(X)) -> s#(X)
   s#(active(X)) -> s#(X)
   dbls#(mark(X)) -> dbls#(X)
   dbls#(active(X)) -> dbls#(X)
   cons#(mark(X1),X2) -> cons#(X1,X2)
   cons#(X1,mark(X2)) -> cons#(X1,X2)
   cons#(active(X1),X2) -> cons#(X1,X2)
   cons#(X1,active(X2)) -> cons#(X1,X2)
   sel#(mark(X1),X2) -> sel#(X1,X2)
   sel#(X1,mark(X2)) -> sel#(X1,X2)
   sel#(active(X1),X2) -> sel#(X1,X2)
   sel#(X1,active(X2)) -> sel#(X1,X2)
   indx#(mark(X1),X2) -> indx#(X1,X2)
   indx#(X1,mark(X2)) -> indx#(X1,X2)
   indx#(active(X1),X2) -> indx#(X1,X2)
   indx#(X1,active(X2)) -> indx#(X1,X2)
   from#(mark(X)) -> from#(X)
   from#(active(X)) -> from#(X)
  TRS:
   active(dbl(0())) -> mark(0())
   active(dbl(s(X))) -> mark(s(s(dbl(X))))
   active(dbls(nil())) -> mark(nil())
   active(dbls(cons(X,Y))) -> mark(cons(dbl(X),dbls(Y)))
   active(sel(0(),cons(X,Y))) -> mark(X)
   active(sel(s(X),cons(Y,Z))) -> mark(sel(X,Z))
   active(indx(nil(),X)) -> mark(nil())
   active(indx(cons(X,Y),Z)) -> mark(cons(sel(X,Z),indx(Y,Z)))
   active(from(X)) -> mark(cons(X,from(s(X))))
   mark(dbl(X)) -> active(dbl(mark(X)))
   mark(0()) -> active(0())
   mark(s(X)) -> active(s(X))
   mark(dbls(X)) -> active(dbls(mark(X)))
   mark(nil()) -> active(nil())
   mark(cons(X1,X2)) -> active(cons(X1,X2))
   mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
   mark(indx(X1,X2)) -> active(indx(mark(X1),X2))
   mark(from(X)) -> active(from(X))
   dbl(mark(X)) -> dbl(X)
   dbl(active(X)) -> dbl(X)
   s(mark(X)) -> s(X)
   s(active(X)) -> s(X)
   dbls(mark(X)) -> dbls(X)
   dbls(active(X)) -> dbls(X)
   cons(mark(X1),X2) -> cons(X1,X2)
   cons(X1,mark(X2)) -> cons(X1,X2)
   cons(active(X1),X2) -> cons(X1,X2)
   cons(X1,active(X2)) -> cons(X1,X2)
   sel(mark(X1),X2) -> sel(X1,X2)
   sel(X1,mark(X2)) -> sel(X1,X2)
   sel(active(X1),X2) -> sel(X1,X2)
   sel(X1,active(X2)) -> sel(X1,X2)
   indx(mark(X1),X2) -> indx(X1,X2)
   indx(X1,mark(X2)) -> indx(X1,X2)
   indx(active(X1),X2) -> indx(X1,X2)
   indx(X1,active(X2)) -> indx(X1,X2)
   from(mark(X)) -> from(X)
   from(active(X)) -> from(X)
  EDG Processor:
   DPs:
    active#(dbl(0())) -> mark#(0())
    active#(dbl(s(X))) -> dbl#(X)
    active#(dbl(s(X))) -> s#(dbl(X))
    active#(dbl(s(X))) -> s#(s(dbl(X)))
    active#(dbl(s(X))) -> mark#(s(s(dbl(X))))
    active#(dbls(nil())) -> mark#(nil())
    active#(dbls(cons(X,Y))) -> dbls#(Y)
    active#(dbls(cons(X,Y))) -> dbl#(X)
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y))
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y)))
    active#(sel(0(),cons(X,Y))) -> mark#(X)
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z)
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z))
    active#(indx(nil(),X)) -> mark#(nil())
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z)
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z)
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z))
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z)))
    active#(from(X)) -> s#(X)
    active#(from(X)) -> from#(s(X))
    active#(from(X)) -> cons#(X,from(s(X)))
    active#(from(X)) -> mark#(cons(X,from(s(X))))
    mark#(dbl(X)) -> mark#(X)
    mark#(dbl(X)) -> dbl#(mark(X))
    mark#(dbl(X)) -> active#(dbl(mark(X)))
    mark#(0()) -> active#(0())
    mark#(s(X)) -> active#(s(X))
    mark#(dbls(X)) -> mark#(X)
    mark#(dbls(X)) -> dbls#(mark(X))
    mark#(dbls(X)) -> active#(dbls(mark(X)))
    mark#(nil()) -> active#(nil())
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    mark#(sel(X1,X2)) -> mark#(X2)
    mark#(sel(X1,X2)) -> mark#(X1)
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    mark#(indx(X1,X2)) -> mark#(X1)
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    mark#(from(X)) -> active#(from(X))
    dbl#(mark(X)) -> dbl#(X)
    dbl#(active(X)) -> dbl#(X)
    s#(mark(X)) -> s#(X)
    s#(active(X)) -> s#(X)
    dbls#(mark(X)) -> dbls#(X)
    dbls#(active(X)) -> dbls#(X)
    cons#(mark(X1),X2) -> cons#(X1,X2)
    cons#(X1,mark(X2)) -> cons#(X1,X2)
    cons#(active(X1),X2) -> cons#(X1,X2)
    cons#(X1,active(X2)) -> cons#(X1,X2)
    sel#(mark(X1),X2) -> sel#(X1,X2)
    sel#(X1,mark(X2)) -> sel#(X1,X2)
    sel#(active(X1),X2) -> sel#(X1,X2)
    sel#(X1,active(X2)) -> sel#(X1,X2)
    indx#(mark(X1),X2) -> indx#(X1,X2)
    indx#(X1,mark(X2)) -> indx#(X1,X2)
    indx#(active(X1),X2) -> indx#(X1,X2)
    indx#(X1,active(X2)) -> indx#(X1,X2)
    from#(mark(X)) -> from#(X)
    from#(active(X)) -> from#(X)
   TRS:
    active(dbl(0())) -> mark(0())
    active(dbl(s(X))) -> mark(s(s(dbl(X))))
    active(dbls(nil())) -> mark(nil())
    active(dbls(cons(X,Y))) -> mark(cons(dbl(X),dbls(Y)))
    active(sel(0(),cons(X,Y))) -> mark(X)
    active(sel(s(X),cons(Y,Z))) -> mark(sel(X,Z))
    active(indx(nil(),X)) -> mark(nil())
    active(indx(cons(X,Y),Z)) -> mark(cons(sel(X,Z),indx(Y,Z)))
    active(from(X)) -> mark(cons(X,from(s(X))))
    mark(dbl(X)) -> active(dbl(mark(X)))
    mark(0()) -> active(0())
    mark(s(X)) -> active(s(X))
    mark(dbls(X)) -> active(dbls(mark(X)))
    mark(nil()) -> active(nil())
    mark(cons(X1,X2)) -> active(cons(X1,X2))
    mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
    mark(indx(X1,X2)) -> active(indx(mark(X1),X2))
    mark(from(X)) -> active(from(X))
    dbl(mark(X)) -> dbl(X)
    dbl(active(X)) -> dbl(X)
    s(mark(X)) -> s(X)
    s(active(X)) -> s(X)
    dbls(mark(X)) -> dbls(X)
    dbls(active(X)) -> dbls(X)
    cons(mark(X1),X2) -> cons(X1,X2)
    cons(X1,mark(X2)) -> cons(X1,X2)
    cons(active(X1),X2) -> cons(X1,X2)
    cons(X1,active(X2)) -> cons(X1,X2)
    sel(mark(X1),X2) -> sel(X1,X2)
    sel(X1,mark(X2)) -> sel(X1,X2)
    sel(active(X1),X2) -> sel(X1,X2)
    sel(X1,active(X2)) -> sel(X1,X2)
    indx(mark(X1),X2) -> indx(X1,X2)
    indx(X1,mark(X2)) -> indx(X1,X2)
    indx(active(X1),X2) -> indx(X1,X2)
    indx(X1,active(X2)) -> indx(X1,X2)
    from(mark(X)) -> from(X)
    from(active(X)) -> from(X)
   graph:
    from#(mark(X)) -> from#(X) -> from#(mark(X)) -> from#(X)
    from#(mark(X)) -> from#(X) -> from#(active(X)) -> from#(X)
    from#(active(X)) -> from#(X) -> from#(mark(X)) -> from#(X)
    from#(active(X)) -> from#(X) -> from#(active(X)) -> from#(X)
    indx#(mark(X1),X2) -> indx#(X1,X2) ->
    indx#(mark(X1),X2) -> indx#(X1,X2)
    indx#(mark(X1),X2) -> indx#(X1,X2) ->
    indx#(X1,mark(X2)) -> indx#(X1,X2)
    indx#(mark(X1),X2) -> indx#(X1,X2) ->
    indx#(active(X1),X2) -> indx#(X1,X2)
    indx#(mark(X1),X2) -> indx#(X1,X2) ->
    indx#(X1,active(X2)) -> indx#(X1,X2)
    indx#(active(X1),X2) -> indx#(X1,X2) ->
    indx#(mark(X1),X2) -> indx#(X1,X2)
    indx#(active(X1),X2) -> indx#(X1,X2) ->
    indx#(X1,mark(X2)) -> indx#(X1,X2)
    indx#(active(X1),X2) -> indx#(X1,X2) ->
    indx#(active(X1),X2) -> indx#(X1,X2)
    indx#(active(X1),X2) -> indx#(X1,X2) ->
    indx#(X1,active(X2)) -> indx#(X1,X2)
    indx#(X1,mark(X2)) -> indx#(X1,X2) ->
    indx#(mark(X1),X2) -> indx#(X1,X2)
    indx#(X1,mark(X2)) -> indx#(X1,X2) ->
    indx#(X1,mark(X2)) -> indx#(X1,X2)
    indx#(X1,mark(X2)) -> indx#(X1,X2) ->
    indx#(active(X1),X2) -> indx#(X1,X2)
    indx#(X1,mark(X2)) -> indx#(X1,X2) ->
    indx#(X1,active(X2)) -> indx#(X1,X2)
    indx#(X1,active(X2)) -> indx#(X1,X2) ->
    indx#(mark(X1),X2) -> indx#(X1,X2)
    indx#(X1,active(X2)) -> indx#(X1,X2) ->
    indx#(X1,mark(X2)) -> indx#(X1,X2)
    indx#(X1,active(X2)) -> indx#(X1,X2) ->
    indx#(active(X1),X2) -> indx#(X1,X2)
    indx#(X1,active(X2)) -> indx#(X1,X2) ->
    indx#(X1,active(X2)) -> indx#(X1,X2)
    sel#(mark(X1),X2) -> sel#(X1,X2) ->
    sel#(mark(X1),X2) -> sel#(X1,X2)
    sel#(mark(X1),X2) -> sel#(X1,X2) ->
    sel#(X1,mark(X2)) -> sel#(X1,X2)
    sel#(mark(X1),X2) -> sel#(X1,X2) ->
    sel#(active(X1),X2) -> sel#(X1,X2)
    sel#(mark(X1),X2) -> sel#(X1,X2) ->
    sel#(X1,active(X2)) -> sel#(X1,X2)
    sel#(active(X1),X2) -> sel#(X1,X2) ->
    sel#(mark(X1),X2) -> sel#(X1,X2)
    sel#(active(X1),X2) -> sel#(X1,X2) ->
    sel#(X1,mark(X2)) -> sel#(X1,X2)
    sel#(active(X1),X2) -> sel#(X1,X2) ->
    sel#(active(X1),X2) -> sel#(X1,X2)
    sel#(active(X1),X2) -> sel#(X1,X2) ->
    sel#(X1,active(X2)) -> sel#(X1,X2)
    sel#(X1,mark(X2)) -> sel#(X1,X2) ->
    sel#(mark(X1),X2) -> sel#(X1,X2)
    sel#(X1,mark(X2)) -> sel#(X1,X2) ->
    sel#(X1,mark(X2)) -> sel#(X1,X2)
    sel#(X1,mark(X2)) -> sel#(X1,X2) ->
    sel#(active(X1),X2) -> sel#(X1,X2)
    sel#(X1,mark(X2)) -> sel#(X1,X2) ->
    sel#(X1,active(X2)) -> sel#(X1,X2)
    sel#(X1,active(X2)) -> sel#(X1,X2) ->
    sel#(mark(X1),X2) -> sel#(X1,X2)
    sel#(X1,active(X2)) -> sel#(X1,X2) ->
    sel#(X1,mark(X2)) -> sel#(X1,X2)
    sel#(X1,active(X2)) -> sel#(X1,X2) ->
    sel#(active(X1),X2) -> sel#(X1,X2)
    sel#(X1,active(X2)) -> sel#(X1,X2) ->
    sel#(X1,active(X2)) -> sel#(X1,X2)
    cons#(mark(X1),X2) -> cons#(X1,X2) ->
    cons#(mark(X1),X2) -> cons#(X1,X2)
    cons#(mark(X1),X2) -> cons#(X1,X2) ->
    cons#(X1,mark(X2)) -> cons#(X1,X2)
    cons#(mark(X1),X2) -> cons#(X1,X2) ->
    cons#(active(X1),X2) -> cons#(X1,X2)
    cons#(mark(X1),X2) -> cons#(X1,X2) ->
    cons#(X1,active(X2)) -> cons#(X1,X2)
    cons#(active(X1),X2) -> cons#(X1,X2) ->
    cons#(mark(X1),X2) -> cons#(X1,X2)
    cons#(active(X1),X2) -> cons#(X1,X2) ->
    cons#(X1,mark(X2)) -> cons#(X1,X2)
    cons#(active(X1),X2) -> cons#(X1,X2) ->
    cons#(active(X1),X2) -> cons#(X1,X2)
    cons#(active(X1),X2) -> cons#(X1,X2) ->
    cons#(X1,active(X2)) -> cons#(X1,X2)
    cons#(X1,mark(X2)) -> cons#(X1,X2) ->
    cons#(mark(X1),X2) -> cons#(X1,X2)
    cons#(X1,mark(X2)) -> cons#(X1,X2) ->
    cons#(X1,mark(X2)) -> cons#(X1,X2)
    cons#(X1,mark(X2)) -> cons#(X1,X2) ->
    cons#(active(X1),X2) -> cons#(X1,X2)
    cons#(X1,mark(X2)) -> cons#(X1,X2) ->
    cons#(X1,active(X2)) -> cons#(X1,X2)
    cons#(X1,active(X2)) -> cons#(X1,X2) ->
    cons#(mark(X1),X2) -> cons#(X1,X2)
    cons#(X1,active(X2)) -> cons#(X1,X2) ->
    cons#(X1,mark(X2)) -> cons#(X1,X2)
    cons#(X1,active(X2)) -> cons#(X1,X2) ->
    cons#(active(X1),X2) -> cons#(X1,X2)
    cons#(X1,active(X2)) -> cons#(X1,X2) ->
    cons#(X1,active(X2)) -> cons#(X1,X2)
    dbls#(mark(X)) -> dbls#(X) -> dbls#(mark(X)) -> dbls#(X)
    dbls#(mark(X)) -> dbls#(X) -> dbls#(active(X)) -> dbls#(X)
    dbls#(active(X)) -> dbls#(X) -> dbls#(mark(X)) -> dbls#(X)
    dbls#(active(X)) -> dbls#(X) -> dbls#(active(X)) -> dbls#(X)
    s#(mark(X)) -> s#(X) -> s#(mark(X)) -> s#(X)
    s#(mark(X)) -> s#(X) -> s#(active(X)) -> s#(X)
    s#(active(X)) -> s#(X) -> s#(mark(X)) -> s#(X)
    s#(active(X)) -> s#(X) -> s#(active(X)) -> s#(X)
    dbl#(mark(X)) -> dbl#(X) -> dbl#(mark(X)) -> dbl#(X)
    dbl#(mark(X)) -> dbl#(X) -> dbl#(active(X)) -> dbl#(X)
    dbl#(active(X)) -> dbl#(X) -> dbl#(mark(X)) -> dbl#(X)
    dbl#(active(X)) -> dbl#(X) -> dbl#(active(X)) -> dbl#(X)
    mark#(from(X)) -> active#(from(X)) ->
    active#(dbl(0())) -> mark#(0())
    mark#(from(X)) -> active#(from(X)) ->
    active#(dbl(s(X))) -> dbl#(X)
    mark#(from(X)) -> active#(from(X)) ->
    active#(dbl(s(X))) -> s#(dbl(X))
    mark#(from(X)) -> active#(from(X)) ->
    active#(dbl(s(X))) -> s#(s(dbl(X)))
    mark#(from(X)) -> active#(from(X)) ->
    active#(dbl(s(X))) -> mark#(s(s(dbl(X))))
    mark#(from(X)) -> active#(from(X)) ->
    active#(dbls(nil())) -> mark#(nil())
    mark#(from(X)) -> active#(from(X)) ->
    active#(dbls(cons(X,Y))) -> dbls#(Y)
    mark#(from(X)) -> active#(from(X)) ->
    active#(dbls(cons(X,Y))) -> dbl#(X)
    mark#(from(X)) -> active#(from(X)) ->
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y))
    mark#(from(X)) -> active#(from(X)) ->
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y)))
    mark#(from(X)) -> active#(from(X)) ->
    active#(sel(0(),cons(X,Y))) -> mark#(X)
    mark#(from(X)) -> active#(from(X)) ->
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z)
    mark#(from(X)) -> active#(from(X)) ->
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z))
    mark#(from(X)) -> active#(from(X)) ->
    active#(indx(nil(),X)) -> mark#(nil())
    mark#(from(X)) -> active#(from(X)) ->
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z)
    mark#(from(X)) -> active#(from(X)) ->
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z)
    mark#(from(X)) -> active#(from(X)) ->
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z))
    mark#(from(X)) -> active#(from(X)) ->
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z)))
    mark#(from(X)) -> active#(from(X)) ->
    active#(from(X)) -> s#(X)
    mark#(from(X)) -> active#(from(X)) ->
    active#(from(X)) -> from#(s(X))
    mark#(from(X)) -> active#(from(X)) ->
    active#(from(X)) -> cons#(X,from(s(X)))
    mark#(from(X)) -> active#(from(X)) ->
    active#(from(X)) -> mark#(cons(X,from(s(X))))
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2) ->
    indx#(mark(X1),X2) -> indx#(X1,X2)
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2) ->
    indx#(X1,mark(X2)) -> indx#(X1,X2)
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2) ->
    indx#(active(X1),X2) -> indx#(X1,X2)
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2) ->
    indx#(X1,active(X2)) -> indx#(X1,X2)
    mark#(indx(X1,X2)) -> mark#(X1) -> mark#(dbl(X)) -> mark#(X)
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(dbl(X)) -> dbl#(mark(X))
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(dbl(X)) -> active#(dbl(mark(X)))
    mark#(indx(X1,X2)) -> mark#(X1) -> mark#(0()) -> active#(0())
    mark#(indx(X1,X2)) -> mark#(X1) -> mark#(s(X)) -> active#(s(X))
    mark#(indx(X1,X2)) -> mark#(X1) -> mark#(dbls(X)) -> mark#(X)
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(dbls(X)) -> dbls#(mark(X))
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(dbls(X)) -> active#(dbls(mark(X)))
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(nil()) -> active#(nil())
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(sel(X1,X2)) -> mark#(X2)
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(sel(X1,X2)) -> mark#(X1)
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(indx(X1,X2)) -> mark#(X1)
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    mark#(indx(X1,X2)) -> mark#(X1) ->
    mark#(from(X)) -> active#(from(X))
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(dbl(0())) -> mark#(0())
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(dbl(s(X))) -> dbl#(X)
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(dbl(s(X))) -> s#(dbl(X))
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(dbl(s(X))) -> s#(s(dbl(X)))
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(dbl(s(X))) -> mark#(s(s(dbl(X))))
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(dbls(nil())) -> mark#(nil())
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(dbls(cons(X,Y))) -> dbls#(Y)
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(dbls(cons(X,Y))) -> dbl#(X)
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y))
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y)))
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(sel(0(),cons(X,Y))) -> mark#(X)
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z)
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z))
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(indx(nil(),X)) -> mark#(nil())
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z)
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z)
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z))
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z)))
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(from(X)) -> s#(X)
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(from(X)) -> from#(s(X))
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(from(X)) -> cons#(X,from(s(X)))
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2)) ->
    active#(from(X)) -> mark#(cons(X,from(s(X))))
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2)) ->
    sel#(mark(X1),X2) -> sel#(X1,X2)
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2)) ->
    sel#(X1,mark(X2)) -> sel#(X1,X2)
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2)) ->
    sel#(active(X1),X2) -> sel#(X1,X2)
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2)) ->
    sel#(X1,active(X2)) -> sel#(X1,X2)
    mark#(sel(X1,X2)) -> mark#(X2) -> mark#(dbl(X)) -> mark#(X)
    mark#(sel(X1,X2)) -> mark#(X2) -> mark#(dbl(X)) -> dbl#(mark(X))
    mark#(sel(X1,X2)) -> mark#(X2) ->
    mark#(dbl(X)) -> active#(dbl(mark(X)))
    mark#(sel(X1,X2)) -> mark#(X2) -> mark#(0()) -> active#(0())
    mark#(sel(X1,X2)) -> mark#(X2) -> mark#(s(X)) -> active#(s(X))
    mark#(sel(X1,X2)) -> mark#(X2) -> mark#(dbls(X)) -> mark#(X)
    mark#(sel(X1,X2)) -> mark#(X2) ->
    mark#(dbls(X)) -> dbls#(mark(X))
    mark#(sel(X1,X2)) -> mark#(X2) ->
    mark#(dbls(X)) -> active#(dbls(mark(X)))
    mark#(sel(X1,X2)) -> mark#(X2) -> mark#(nil()) -> active#(nil())
    mark#(sel(X1,X2)) -> mark#(X2) ->
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    mark#(sel(X1,X2)) -> mark#(X2) -> mark#(sel(X1,X2)) -> mark#(X2)
    mark#(sel(X1,X2)) -> mark#(X2) -> mark#(sel(X1,X2)) -> mark#(X1)
    mark#(sel(X1,X2)) -> mark#(X2) ->
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    mark#(sel(X1,X2)) -> mark#(X2) ->
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    mark#(sel(X1,X2)) -> mark#(X2) -> mark#(indx(X1,X2)) -> mark#(X1)
    mark#(sel(X1,X2)) -> mark#(X2) ->
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    mark#(sel(X1,X2)) -> mark#(X2) ->
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    mark#(sel(X1,X2)) -> mark#(X2) ->
    mark#(from(X)) -> active#(from(X))
    mark#(sel(X1,X2)) -> mark#(X1) -> mark#(dbl(X)) -> mark#(X)
    mark#(sel(X1,X2)) -> mark#(X1) -> mark#(dbl(X)) -> dbl#(mark(X))
    mark#(sel(X1,X2)) -> mark#(X1) ->
    mark#(dbl(X)) -> active#(dbl(mark(X)))
    mark#(sel(X1,X2)) -> mark#(X1) -> mark#(0()) -> active#(0())
    mark#(sel(X1,X2)) -> mark#(X1) -> mark#(s(X)) -> active#(s(X))
    mark#(sel(X1,X2)) -> mark#(X1) -> mark#(dbls(X)) -> mark#(X)
    mark#(sel(X1,X2)) -> mark#(X1) ->
    mark#(dbls(X)) -> dbls#(mark(X))
    mark#(sel(X1,X2)) -> mark#(X1) ->
    mark#(dbls(X)) -> active#(dbls(mark(X)))
    mark#(sel(X1,X2)) -> mark#(X1) -> mark#(nil()) -> active#(nil())
    mark#(sel(X1,X2)) -> mark#(X1) ->
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    mark#(sel(X1,X2)) -> mark#(X1) -> mark#(sel(X1,X2)) -> mark#(X2)
    mark#(sel(X1,X2)) -> mark#(X1) -> mark#(sel(X1,X2)) -> mark#(X1)
    mark#(sel(X1,X2)) -> mark#(X1) ->
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    mark#(sel(X1,X2)) -> mark#(X1) ->
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    mark#(sel(X1,X2)) -> mark#(X1) -> mark#(indx(X1,X2)) -> mark#(X1)
    mark#(sel(X1,X2)) -> mark#(X1) ->
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    mark#(sel(X1,X2)) -> mark#(X1) ->
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    mark#(sel(X1,X2)) -> mark#(X1) ->
    mark#(from(X)) -> active#(from(X))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(dbl(0())) -> mark#(0())
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(dbl(s(X))) -> dbl#(X)
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(dbl(s(X))) -> s#(dbl(X))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(dbl(s(X))) -> s#(s(dbl(X)))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(dbl(s(X))) -> mark#(s(s(dbl(X))))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(dbls(nil())) -> mark#(nil())
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(dbls(cons(X,Y))) -> dbls#(Y)
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(dbls(cons(X,Y))) -> dbl#(X)
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y)))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(sel(0(),cons(X,Y))) -> mark#(X)
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z)
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(indx(nil(),X)) -> mark#(nil())
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z)
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z)
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z)))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(from(X)) -> s#(X)
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(from(X)) -> from#(s(X))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(from(X)) -> cons#(X,from(s(X)))
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2))) ->
    active#(from(X)) -> mark#(cons(X,from(s(X))))
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(dbl(0())) -> mark#(0())
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(dbl(s(X))) -> dbl#(X)
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(dbl(s(X))) -> s#(dbl(X))
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(dbl(s(X))) -> s#(s(dbl(X)))
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(dbl(s(X))) -> mark#(s(s(dbl(X))))
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(dbls(nil())) -> mark#(nil())
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(dbls(cons(X,Y))) -> dbls#(Y)
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(dbls(cons(X,Y))) -> dbl#(X)
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y))
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y)))
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(sel(0(),cons(X,Y))) -> mark#(X)
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z)
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z))
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(indx(nil(),X)) -> mark#(nil())
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z)
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z)
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z))
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z)))
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(from(X)) -> s#(X)
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(from(X)) -> from#(s(X))
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(from(X)) -> cons#(X,from(s(X)))
    mark#(cons(X1,X2)) -> active#(cons(X1,X2)) ->
    active#(from(X)) -> mark#(cons(X,from(s(X))))
    mark#(dbls(X)) -> dbls#(mark(X)) -> dbls#(mark(X)) -> dbls#(X)
    mark#(dbls(X)) -> dbls#(mark(X)) -> dbls#(active(X)) -> dbls#(X)
    mark#(dbls(X)) -> mark#(X) -> mark#(dbl(X)) -> mark#(X)
    mark#(dbls(X)) -> mark#(X) -> mark#(dbl(X)) -> dbl#(mark(X))
    mark#(dbls(X)) -> mark#(X) -> mark#(dbl(X)) -> active#(dbl(mark(X)))
    mark#(dbls(X)) -> mark#(X) -> mark#(0()) -> active#(0())
    mark#(dbls(X)) -> mark#(X) -> mark#(s(X)) -> active#(s(X))
    mark#(dbls(X)) -> mark#(X) -> mark#(dbls(X)) -> mark#(X)
    mark#(dbls(X)) -> mark#(X) -> mark#(dbls(X)) -> dbls#(mark(X))
    mark#(dbls(X)) -> mark#(X) ->
    mark#(dbls(X)) -> active#(dbls(mark(X)))
    mark#(dbls(X)) -> mark#(X) -> mark#(nil()) -> active#(nil())
    mark#(dbls(X)) -> mark#(X) ->
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    mark#(dbls(X)) -> mark#(X) -> mark#(sel(X1,X2)) -> mark#(X2)
    mark#(dbls(X)) -> mark#(X) -> mark#(sel(X1,X2)) -> mark#(X1)
    mark#(dbls(X)) -> mark#(X) ->
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    mark#(dbls(X)) -> mark#(X) ->
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    mark#(dbls(X)) -> mark#(X) -> mark#(indx(X1,X2)) -> mark#(X1)
    mark#(dbls(X)) -> mark#(X) ->
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    mark#(dbls(X)) -> mark#(X) ->
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    mark#(dbls(X)) -> mark#(X) ->
    mark#(from(X)) -> active#(from(X))
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(dbl(0())) -> mark#(0())
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(dbl(s(X))) -> dbl#(X)
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(dbl(s(X))) -> s#(dbl(X))
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(dbl(s(X))) -> s#(s(dbl(X)))
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(dbl(s(X))) -> mark#(s(s(dbl(X))))
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(dbls(nil())) -> mark#(nil())
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(dbls(cons(X,Y))) -> dbls#(Y)
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(dbls(cons(X,Y))) -> dbl#(X)
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y))
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y)))
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(sel(0(),cons(X,Y))) -> mark#(X)
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z)
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z))
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(indx(nil(),X)) -> mark#(nil())
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z)
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z)
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z))
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z)))
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(from(X)) -> s#(X)
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(from(X)) -> from#(s(X))
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(from(X)) -> cons#(X,from(s(X)))
    mark#(dbls(X)) -> active#(dbls(mark(X))) ->
    active#(from(X)) -> mark#(cons(X,from(s(X))))
    mark#(s(X)) -> active#(s(X)) -> active#(dbl(0())) -> mark#(0())
    mark#(s(X)) -> active#(s(X)) -> active#(dbl(s(X))) -> dbl#(X)
    mark#(s(X)) -> active#(s(X)) -> active#(dbl(s(X))) -> s#(dbl(X))
    mark#(s(X)) -> active#(s(X)) -> active#(dbl(s(X))) -> s#(s(dbl(X)))
    mark#(s(X)) -> active#(s(X)) ->
    active#(dbl(s(X))) -> mark#(s(s(dbl(X))))
    mark#(s(X)) -> active#(s(X)) ->
    active#(dbls(nil())) -> mark#(nil())
    mark#(s(X)) -> active#(s(X)) ->
    active#(dbls(cons(X,Y))) -> dbls#(Y)
    mark#(s(X)) -> active#(s(X)) -> active#(dbls(cons(X,Y))) -> dbl#(X)
    mark#(s(X)) -> active#(s(X)) ->
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y))
    mark#(s(X)) -> active#(s(X)) ->
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y)))
    mark#(s(X)) -> active#(s(X)) ->
    active#(sel(0(),cons(X,Y))) -> mark#(X)
    mark#(s(X)) -> active#(s(X)) ->
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z)
    mark#(s(X)) -> active#(s(X)) ->
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z))
    mark#(s(X)) -> active#(s(X)) ->
    active#(indx(nil(),X)) -> mark#(nil())
    mark#(s(X)) -> active#(s(X)) ->
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z)
    mark#(s(X)) -> active#(s(X)) ->
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z)
    mark#(s(X)) -> active#(s(X)) ->
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z))
    mark#(s(X)) -> active#(s(X)) ->
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z)))
    mark#(s(X)) -> active#(s(X)) -> active#(from(X)) -> s#(X)
    mark#(s(X)) -> active#(s(X)) -> active#(from(X)) -> from#(s(X))
    mark#(s(X)) -> active#(s(X)) ->
    active#(from(X)) -> cons#(X,from(s(X)))
    mark#(s(X)) -> active#(s(X)) ->
    active#(from(X)) -> mark#(cons(X,from(s(X))))
    mark#(dbl(X)) -> dbl#(mark(X)) -> dbl#(mark(X)) -> dbl#(X)
    mark#(dbl(X)) -> dbl#(mark(X)) -> dbl#(active(X)) -> dbl#(X)
    mark#(dbl(X)) -> mark#(X) -> mark#(dbl(X)) -> mark#(X)
    mark#(dbl(X)) -> mark#(X) -> mark#(dbl(X)) -> dbl#(mark(X))
    mark#(dbl(X)) -> mark#(X) -> mark#(dbl(X)) -> active#(dbl(mark(X)))
    mark#(dbl(X)) -> mark#(X) -> mark#(0()) -> active#(0())
    mark#(dbl(X)) -> mark#(X) -> mark#(s(X)) -> active#(s(X))
    mark#(dbl(X)) -> mark#(X) -> mark#(dbls(X)) -> mark#(X)
    mark#(dbl(X)) -> mark#(X) -> mark#(dbls(X)) -> dbls#(mark(X))
    mark#(dbl(X)) -> mark#(X) -> mark#(dbls(X)) -> active#(dbls(mark(X)))
    mark#(dbl(X)) -> mark#(X) -> mark#(nil()) -> active#(nil())
    mark#(dbl(X)) -> mark#(X) ->
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    mark#(dbl(X)) -> mark#(X) -> mark#(sel(X1,X2)) -> mark#(X2)
    mark#(dbl(X)) -> mark#(X) -> mark#(sel(X1,X2)) -> mark#(X1)
    mark#(dbl(X)) -> mark#(X) ->
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    mark#(dbl(X)) -> mark#(X) ->
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    mark#(dbl(X)) -> mark#(X) -> mark#(indx(X1,X2)) -> mark#(X1)
    mark#(dbl(X)) -> mark#(X) -> mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    mark#(dbl(X)) -> mark#(X) ->
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    mark#(dbl(X)) -> mark#(X) ->
    mark#(from(X)) -> active#(from(X))
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(dbl(0())) -> mark#(0())
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(dbl(s(X))) -> dbl#(X)
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(dbl(s(X))) -> s#(dbl(X))
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(dbl(s(X))) -> s#(s(dbl(X)))
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(dbl(s(X))) -> mark#(s(s(dbl(X))))
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(dbls(nil())) -> mark#(nil())
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(dbls(cons(X,Y))) -> dbls#(Y)
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(dbls(cons(X,Y))) -> dbl#(X)
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y))
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y)))
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(sel(0(),cons(X,Y))) -> mark#(X)
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z)
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z))
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(indx(nil(),X)) -> mark#(nil())
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z)
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z)
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z))
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z)))
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(from(X)) -> s#(X)
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(from(X)) -> from#(s(X))
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(from(X)) -> cons#(X,from(s(X)))
    mark#(dbl(X)) -> active#(dbl(mark(X))) ->
    active#(from(X)) -> mark#(cons(X,from(s(X))))
    active#(from(X)) -> from#(s(X)) -> from#(mark(X)) -> from#(X)
    active#(from(X)) -> from#(s(X)) ->
    from#(active(X)) -> from#(X)
    active#(from(X)) -> cons#(X,from(s(X))) ->
    cons#(mark(X1),X2) -> cons#(X1,X2)
    active#(from(X)) -> cons#(X,from(s(X))) ->
    cons#(X1,mark(X2)) -> cons#(X1,X2)
    active#(from(X)) -> cons#(X,from(s(X))) ->
    cons#(active(X1),X2) -> cons#(X1,X2)
    active#(from(X)) -> cons#(X,from(s(X))) ->
    cons#(X1,active(X2)) -> cons#(X1,X2)
    active#(from(X)) -> s#(X) -> s#(mark(X)) -> s#(X)
    active#(from(X)) -> s#(X) ->
    s#(active(X)) -> s#(X)
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(dbl(X)) -> mark#(X)
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(dbl(X)) -> dbl#(mark(X))
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(dbl(X)) -> active#(dbl(mark(X)))
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(s(X)) -> active#(s(X))
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(dbls(X)) -> mark#(X)
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(dbls(X)) -> dbls#(mark(X))
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(dbls(X)) -> active#(dbls(mark(X)))
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(sel(X1,X2)) -> mark#(X2)
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(sel(X1,X2)) -> mark#(X1)
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(indx(X1,X2)) -> mark#(X1)
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    active#(from(X)) -> mark#(cons(X,from(s(X)))) ->
    mark#(from(X)) -> active#(from(X))
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z) ->
    indx#(mark(X1),X2) -> indx#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z) ->
    indx#(X1,mark(X2)) -> indx#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z) ->
    indx#(active(X1),X2) -> indx#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> indx#(Y,Z) ->
    indx#(X1,active(X2)) -> indx#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z) ->
    sel#(mark(X1),X2) -> sel#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z) ->
    sel#(X1,mark(X2)) -> sel#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z) ->
    sel#(active(X1),X2) -> sel#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> sel#(X,Z) ->
    sel#(X1,active(X2)) -> sel#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z)) ->
    cons#(mark(X1),X2) -> cons#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z)) ->
    cons#(X1,mark(X2)) -> cons#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z)) ->
    cons#(active(X1),X2) -> cons#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> cons#(sel(X,Z),indx(Y,Z)) ->
    cons#(X1,active(X2)) -> cons#(X1,X2)
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(dbl(X)) -> mark#(X)
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(dbl(X)) -> dbl#(mark(X))
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(dbl(X)) -> active#(dbl(mark(X)))
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(s(X)) -> active#(s(X))
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(dbls(X)) -> mark#(X)
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(dbls(X)) -> dbls#(mark(X))
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(dbls(X)) -> active#(dbls(mark(X)))
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(sel(X1,X2)) -> mark#(X2)
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(sel(X1,X2)) -> mark#(X1)
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(indx(X1,X2)) -> mark#(X1)
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z))) ->
    mark#(from(X)) -> active#(from(X))
    active#(indx(nil(),X)) -> mark#(nil()) ->
    mark#(nil()) -> active#(nil())
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z) ->
    sel#(mark(X1),X2) -> sel#(X1,X2)
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z) ->
    sel#(X1,mark(X2)) -> sel#(X1,X2)
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z) ->
    sel#(active(X1),X2) -> sel#(X1,X2)
    active#(sel(s(X),cons(Y,Z))) -> sel#(X,Z) ->
    sel#(X1,active(X2)) -> sel#(X1,X2)
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(dbl(X)) -> mark#(X)
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(dbl(X)) -> dbl#(mark(X))
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(dbl(X)) -> active#(dbl(mark(X)))
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(s(X)) -> active#(s(X))
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(dbls(X)) -> mark#(X)
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(dbls(X)) -> dbls#(mark(X))
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(dbls(X)) -> active#(dbls(mark(X)))
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(sel(X1,X2)) -> mark#(X2)
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(sel(X1,X2)) -> mark#(X1)
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(indx(X1,X2)) -> mark#(X1)
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z)) ->
    mark#(from(X)) -> active#(from(X))
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(dbl(X)) -> mark#(X)
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(dbl(X)) -> dbl#(mark(X))
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(dbl(X)) -> active#(dbl(mark(X)))
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(0()) -> active#(0())
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(s(X)) -> active#(s(X))
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(dbls(X)) -> mark#(X)
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(dbls(X)) -> dbls#(mark(X))
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(dbls(X)) -> active#(dbls(mark(X)))
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(nil()) -> active#(nil())
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(sel(X1,X2)) -> mark#(X2)
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(sel(X1,X2)) -> mark#(X1)
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(indx(X1,X2)) -> mark#(X1)
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    active#(sel(0(),cons(X,Y))) -> mark#(X) ->
    mark#(from(X)) -> active#(from(X))
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y)) ->
    cons#(mark(X1),X2) -> cons#(X1,X2)
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y)) ->
    cons#(X1,mark(X2)) -> cons#(X1,X2)
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y)) ->
    cons#(active(X1),X2) -> cons#(X1,X2)
    active#(dbls(cons(X,Y))) -> cons#(dbl(X),dbls(Y)) ->
    cons#(X1,active(X2)) -> cons#(X1,X2)
    active#(dbls(cons(X,Y))) -> dbls#(Y) ->
    dbls#(mark(X)) -> dbls#(X)
    active#(dbls(cons(X,Y))) -> dbls#(Y) ->
    dbls#(active(X)) -> dbls#(X)
    active#(dbls(cons(X,Y))) -> dbl#(X) ->
    dbl#(mark(X)) -> dbl#(X)
    active#(dbls(cons(X,Y))) -> dbl#(X) ->
    dbl#(active(X)) -> dbl#(X)
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(dbl(X)) -> mark#(X)
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(dbl(X)) -> dbl#(mark(X))
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(dbl(X)) -> active#(dbl(mark(X)))
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(s(X)) -> active#(s(X))
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(dbls(X)) -> mark#(X)
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(dbls(X)) -> dbls#(mark(X))
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(dbls(X)) -> active#(dbls(mark(X)))
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(sel(X1,X2)) -> mark#(X2)
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(sel(X1,X2)) -> mark#(X1)
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(indx(X1,X2)) -> mark#(X1)
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y))) ->
    mark#(from(X)) -> active#(from(X))
    active#(dbls(nil())) -> mark#(nil()) ->
    mark#(nil()) -> active#(nil())
    active#(dbl(s(X))) -> s#(s(dbl(X))) -> s#(mark(X)) -> s#(X)
    active#(dbl(s(X))) -> s#(s(dbl(X))) -> s#(active(X)) -> s#(X)
    active#(dbl(s(X))) -> s#(dbl(X)) -> s#(mark(X)) -> s#(X)
    active#(dbl(s(X))) -> s#(dbl(X)) -> s#(active(X)) -> s#(X)
    active#(dbl(s(X))) -> dbl#(X) -> dbl#(mark(X)) -> dbl#(X)
    active#(dbl(s(X))) -> dbl#(X) ->
    dbl#(active(X)) -> dbl#(X)
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(dbl(X)) -> mark#(X)
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(dbl(X)) -> dbl#(mark(X))
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(dbl(X)) -> active#(dbl(mark(X)))
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(s(X)) -> active#(s(X))
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(dbls(X)) -> mark#(X)
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(dbls(X)) -> dbls#(mark(X))
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(dbls(X)) -> active#(dbls(mark(X)))
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(cons(X1,X2)) -> active#(cons(X1,X2))
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(sel(X1,X2)) -> mark#(X2)
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(sel(X1,X2)) -> mark#(X1)
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(sel(X1,X2)) -> sel#(mark(X1),mark(X2))
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(indx(X1,X2)) -> mark#(X1)
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(indx(X1,X2)) -> indx#(mark(X1),X2)
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
    active#(dbl(s(X))) -> mark#(s(s(dbl(X)))) ->
    mark#(from(X)) -> active#(from(X))
    active#(dbl(0())) -> mark#(0()) -> mark#(0()) -> active#(0())
   SCC Processor:
    #sccs: 8
    #rules: 38
    #arcs: 459/3600
    DPs:
     mark#(from(X)) -> active#(from(X))
     active#(from(X)) -> mark#(cons(X,from(s(X))))
     mark#(indx(X1,X2)) -> active#(indx(mark(X1),X2))
     active#(indx(cons(X,Y),Z)) -> mark#(cons(sel(X,Z),indx(Y,Z)))
     mark#(indx(X1,X2)) -> mark#(X1)
     mark#(sel(X1,X2)) -> active#(sel(mark(X1),mark(X2)))
     active#(sel(s(X),cons(Y,Z))) -> mark#(sel(X,Z))
     mark#(sel(X1,X2)) -> mark#(X1)
     mark#(sel(X1,X2)) -> mark#(X2)
     mark#(cons(X1,X2)) -> active#(cons(X1,X2))
     active#(sel(0(),cons(X,Y))) -> mark#(X)
     mark#(dbls(X)) -> active#(dbls(mark(X)))
     active#(dbls(cons(X,Y))) -> mark#(cons(dbl(X),dbls(Y)))
     mark#(dbls(X)) -> mark#(X)
     mark#(s(X)) -> active#(s(X))
     active#(dbl(s(X))) -> mark#(s(s(dbl(X))))
     mark#(dbl(X)) -> active#(dbl(mark(X)))
     mark#(dbl(X)) -> mark#(X)
    TRS:
     active(dbl(0())) -> mark(0())
     active(dbl(s(X))) -> mark(s(s(dbl(X))))
     active(dbls(nil())) -> mark(nil())
     active(dbls(cons(X,Y))) -> mark(cons(dbl(X),dbls(Y)))
     active(sel(0(),cons(X,Y))) -> mark(X)
     active(sel(s(X),cons(Y,Z))) -> mark(sel(X,Z))
     active(indx(nil(),X)) -> mark(nil())
     active(indx(cons(X,Y),Z)) -> mark(cons(sel(X,Z),indx(Y,Z)))
     active(from(X)) -> mark(cons(X,from(s(X))))
     mark(dbl(X)) -> active(dbl(mark(X)))
     mark(0()) -> active(0())
     mark(s(X)) -> active(s(X))
     mark(dbls(X)) -> active(dbls(mark(X)))
     mark(nil()) -> active(nil())
     mark(cons(X1,X2)) -> active(cons(X1,X2))
     mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
     mark(indx(X1,X2)) -> active(indx(mark(X1),X2))
     mark(from(X)) -> active(from(X))
     dbl(mark(X)) -> dbl(X)
     dbl(active(X)) -> dbl(X)
     s(mark(X)) -> s(X)
     s(active(X)) -> s(X)
     dbls(mark(X)) -> dbls(X)
     dbls(active(X)) -> dbls(X)
     cons(mark(X1),X2) -> cons(X1,X2)
     cons(X1,mark(X2)) -> cons(X1,X2)
     cons(active(X1),X2) -> cons(X1,X2)
     cons(X1,active(X2)) -> cons(X1,X2)
     sel(mark(X1),X2) -> sel(X1,X2)
     sel(X1,mark(X2)) -> sel(X1,X2)
     sel(active(X1),X2) -> sel(X1,X2)
     sel(X1,active(X2)) -> sel(X1,X2)
     indx(mark(X1),X2) -> indx(X1,X2)
     indx(X1,mark(X2)) -> indx(X1,X2)
     indx(active(X1),X2) -> indx(X1,X2)
     indx(X1,active(X2)) -> indx(X1,X2)
     from(mark(X)) -> from(X)
     from(active(X)) -> from(X)
    Open
    
    DPs:
     dbl#(mark(X)) -> dbl#(X)
     dbl#(active(X)) -> dbl#(X)
    TRS:
     active(dbl(0())) -> mark(0())
     active(dbl(s(X))) -> mark(s(s(dbl(X))))
     active(dbls(nil())) -> mark(nil())
     active(dbls(cons(X,Y))) -> mark(cons(dbl(X),dbls(Y)))
     active(sel(0(),cons(X,Y))) -> mark(X)
     active(sel(s(X),cons(Y,Z))) -> mark(sel(X,Z))
     active(indx(nil(),X)) -> mark(nil())
     active(indx(cons(X,Y),Z)) -> mark(cons(sel(X,Z),indx(Y,Z)))
     active(from(X)) -> mark(cons(X,from(s(X))))
     mark(dbl(X)) -> active(dbl(mark(X)))
     mark(0()) -> active(0())
     mark(s(X)) -> active(s(X))
     mark(dbls(X)) -> active(dbls(mark(X)))
     mark(nil()) -> active(nil())
     mark(cons(X1,X2)) -> active(cons(X1,X2))
     mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
     mark(indx(X1,X2)) -> active(indx(mark(X1),X2))
     mark(from(X)) -> active(from(X))
     dbl(mark(X)) -> dbl(X)
     dbl(active(X)) -> dbl(X)
     s(mark(X)) -> s(X)
     s(active(X)) -> s(X)
     dbls(mark(X)) -> dbls(X)
     dbls(active(X)) -> dbls(X)
     cons(mark(X1),X2) -> cons(X1,X2)
     cons(X1,mark(X2)) -> cons(X1,X2)
     cons(active(X1),X2) -> cons(X1,X2)
     cons(X1,active(X2)) -> cons(X1,X2)
     sel(mark(X1),X2) -> sel(X1,X2)
     sel(X1,mark(X2)) -> sel(X1,X2)
     sel(active(X1),X2) -> sel(X1,X2)
     sel(X1,active(X2)) -> sel(X1,X2)
     indx(mark(X1),X2) -> indx(X1,X2)
     indx(X1,mark(X2)) -> indx(X1,X2)
     indx(active(X1),X2) -> indx(X1,X2)
     indx(X1,active(X2)) -> indx(X1,X2)
     from(mark(X)) -> from(X)
     from(active(X)) -> from(X)
    Open
    
    DPs:
     s#(mark(X)) -> s#(X)
     s#(active(X)) -> s#(X)
    TRS:
     active(dbl(0())) -> mark(0())
     active(dbl(s(X))) -> mark(s(s(dbl(X))))
     active(dbls(nil())) -> mark(nil())
     active(dbls(cons(X,Y))) -> mark(cons(dbl(X),dbls(Y)))
     active(sel(0(),cons(X,Y))) -> mark(X)
     active(sel(s(X),cons(Y,Z))) -> mark(sel(X,Z))
     active(indx(nil(),X)) -> mark(nil())
     active(indx(cons(X,Y),Z)) -> mark(cons(sel(X,Z),indx(Y,Z)))
     active(from(X)) -> mark(cons(X,from(s(X))))
     mark(dbl(X)) -> active(dbl(mark(X)))
     mark(0()) -> active(0())
     mark(s(X)) -> active(s(X))
     mark(dbls(X)) -> active(dbls(mark(X)))
     mark(nil()) -> active(nil())
     mark(cons(X1,X2)) -> active(cons(X1,X2))
     mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
     mark(indx(X1,X2)) -> active(indx(mark(X1),X2))
     mark(from(X)) -> active(from(X))
     dbl(mark(X)) -> dbl(X)
     dbl(active(X)) -> dbl(X)
     s(mark(X)) -> s(X)
     s(active(X)) -> s(X)
     dbls(mark(X)) -> dbls(X)
     dbls(active(X)) -> dbls(X)
     cons(mark(X1),X2) -> cons(X1,X2)
     cons(X1,mark(X2)) -> cons(X1,X2)
     cons(active(X1),X2) -> cons(X1,X2)
     cons(X1,active(X2)) -> cons(X1,X2)
     sel(mark(X1),X2) -> sel(X1,X2)
     sel(X1,mark(X2)) -> sel(X1,X2)
     sel(active(X1),X2) -> sel(X1,X2)
     sel(X1,active(X2)) -> sel(X1,X2)
     indx(mark(X1),X2) -> indx(X1,X2)
     indx(X1,mark(X2)) -> indx(X1,X2)
     indx(active(X1),X2) -> indx(X1,X2)
     indx(X1,active(X2)) -> indx(X1,X2)
     from(mark(X)) -> from(X)
     from(active(X)) -> from(X)
    Open
    
    DPs:
     dbls#(mark(X)) -> dbls#(X)
     dbls#(active(X)) -> dbls#(X)
    TRS:
     active(dbl(0())) -> mark(0())
     active(dbl(s(X))) -> mark(s(s(dbl(X))))
     active(dbls(nil())) -> mark(nil())
     active(dbls(cons(X,Y))) -> mark(cons(dbl(X),dbls(Y)))
     active(sel(0(),cons(X,Y))) -> mark(X)
     active(sel(s(X),cons(Y,Z))) -> mark(sel(X,Z))
     active(indx(nil(),X)) -> mark(nil())
     active(indx(cons(X,Y),Z)) -> mark(cons(sel(X,Z),indx(Y,Z)))
     active(from(X)) -> mark(cons(X,from(s(X))))
     mark(dbl(X)) -> active(dbl(mark(X)))
     mark(0()) -> active(0())
     mark(s(X)) -> active(s(X))
     mark(dbls(X)) -> active(dbls(mark(X)))
     mark(nil()) -> active(nil())
     mark(cons(X1,X2)) -> active(cons(X1,X2))
     mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
     mark(indx(X1,X2)) -> active(indx(mark(X1),X2))
     mark(from(X)) -> active(from(X))
     dbl(mark(X)) -> dbl(X)
     dbl(active(X)) -> dbl(X)
     s(mark(X)) -> s(X)
     s(active(X)) -> s(X)
     dbls(mark(X)) -> dbls(X)
     dbls(active(X)) -> dbls(X)
     cons(mark(X1),X2) -> cons(X1,X2)
     cons(X1,mark(X2)) -> cons(X1,X2)
     cons(active(X1),X2) -> cons(X1,X2)
     cons(X1,active(X2)) -> cons(X1,X2)
     sel(mark(X1),X2) -> sel(X1,X2)
     sel(X1,mark(X2)) -> sel(X1,X2)
     sel(active(X1),X2) -> sel(X1,X2)
     sel(X1,active(X2)) -> sel(X1,X2)
     indx(mark(X1),X2) -> indx(X1,X2)
     indx(X1,mark(X2)) -> indx(X1,X2)
     indx(active(X1),X2) -> indx(X1,X2)
     indx(X1,active(X2)) -> indx(X1,X2)
     from(mark(X)) -> from(X)
     from(active(X)) -> from(X)
    Open
    
    DPs:
     cons#(mark(X1),X2) -> cons#(X1,X2)
     cons#(X1,active(X2)) -> cons#(X1,X2)
     cons#(active(X1),X2) -> cons#(X1,X2)
     cons#(X1,mark(X2)) -> cons#(X1,X2)
    TRS:
     active(dbl(0())) -> mark(0())
     active(dbl(s(X))) -> mark(s(s(dbl(X))))
     active(dbls(nil())) -> mark(nil())
     active(dbls(cons(X,Y))) -> mark(cons(dbl(X),dbls(Y)))
     active(sel(0(),cons(X,Y))) -> mark(X)
     active(sel(s(X),cons(Y,Z))) -> mark(sel(X,Z))
     active(indx(nil(),X)) -> mark(nil())
     active(indx(cons(X,Y),Z)) -> mark(cons(sel(X,Z),indx(Y,Z)))
     active(from(X)) -> mark(cons(X,from(s(X))))
     mark(dbl(X)) -> active(dbl(mark(X)))
     mark(0()) -> active(0())
     mark(s(X)) -> active(s(X))
     mark(dbls(X)) -> active(dbls(mark(X)))
     mark(nil()) -> active(nil())
     mark(cons(X1,X2)) -> active(cons(X1,X2))
     mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
     mark(indx(X1,X2)) -> active(indx(mark(X1),X2))
     mark(from(X)) -> active(from(X))
     dbl(mark(X)) -> dbl(X)
     dbl(active(X)) -> dbl(X)
     s(mark(X)) -> s(X)
     s(active(X)) -> s(X)
     dbls(mark(X)) -> dbls(X)
     dbls(active(X)) -> dbls(X)
     cons(mark(X1),X2) -> cons(X1,X2)
     cons(X1,mark(X2)) -> cons(X1,X2)
     cons(active(X1),X2) -> cons(X1,X2)
     cons(X1,active(X2)) -> cons(X1,X2)
     sel(mark(X1),X2) -> sel(X1,X2)
     sel(X1,mark(X2)) -> sel(X1,X2)
     sel(active(X1),X2) -> sel(X1,X2)
     sel(X1,active(X2)) -> sel(X1,X2)
     indx(mark(X1),X2) -> indx(X1,X2)
     indx(X1,mark(X2)) -> indx(X1,X2)
     indx(active(X1),X2) -> indx(X1,X2)
     indx(X1,active(X2)) -> indx(X1,X2)
     from(mark(X)) -> from(X)
     from(active(X)) -> from(X)
    Open
    
    DPs:
     sel#(mark(X1),X2) -> sel#(X1,X2)
     sel#(X1,active(X2)) -> sel#(X1,X2)
     sel#(active(X1),X2) -> sel#(X1,X2)
     sel#(X1,mark(X2)) -> sel#(X1,X2)
    TRS:
     active(dbl(0())) -> mark(0())
     active(dbl(s(X))) -> mark(s(s(dbl(X))))
     active(dbls(nil())) -> mark(nil())
     active(dbls(cons(X,Y))) -> mark(cons(dbl(X),dbls(Y)))
     active(sel(0(),cons(X,Y))) -> mark(X)
     active(sel(s(X),cons(Y,Z))) -> mark(sel(X,Z))
     active(indx(nil(),X)) -> mark(nil())
     active(indx(cons(X,Y),Z)) -> mark(cons(sel(X,Z),indx(Y,Z)))
     active(from(X)) -> mark(cons(X,from(s(X))))
     mark(dbl(X)) -> active(dbl(mark(X)))
     mark(0()) -> active(0())
     mark(s(X)) -> active(s(X))
     mark(dbls(X)) -> active(dbls(mark(X)))
     mark(nil()) -> active(nil())
     mark(cons(X1,X2)) -> active(cons(X1,X2))
     mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
     mark(indx(X1,X2)) -> active(indx(mark(X1),X2))
     mark(from(X)) -> active(from(X))
     dbl(mark(X)) -> dbl(X)
     dbl(active(X)) -> dbl(X)
     s(mark(X)) -> s(X)
     s(active(X)) -> s(X)
     dbls(mark(X)) -> dbls(X)
     dbls(active(X)) -> dbls(X)
     cons(mark(X1),X2) -> cons(X1,X2)
     cons(X1,mark(X2)) -> cons(X1,X2)
     cons(active(X1),X2) -> cons(X1,X2)
     cons(X1,active(X2)) -> cons(X1,X2)
     sel(mark(X1),X2) -> sel(X1,X2)
     sel(X1,mark(X2)) -> sel(X1,X2)
     sel(active(X1),X2) -> sel(X1,X2)
     sel(X1,active(X2)) -> sel(X1,X2)
     indx(mark(X1),X2) -> indx(X1,X2)
     indx(X1,mark(X2)) -> indx(X1,X2)
     indx(active(X1),X2) -> indx(X1,X2)
     indx(X1,active(X2)) -> indx(X1,X2)
     from(mark(X)) -> from(X)
     from(active(X)) -> from(X)
    Open
    
    DPs:
     indx#(mark(X1),X2) -> indx#(X1,X2)
     indx#(X1,active(X2)) -> indx#(X1,X2)
     indx#(active(X1),X2) -> indx#(X1,X2)
     indx#(X1,mark(X2)) -> indx#(X1,X2)
    TRS:
     active(dbl(0())) -> mark(0())
     active(dbl(s(X))) -> mark(s(s(dbl(X))))
     active(dbls(nil())) -> mark(nil())
     active(dbls(cons(X,Y))) -> mark(cons(dbl(X),dbls(Y)))
     active(sel(0(),cons(X,Y))) -> mark(X)
     active(sel(s(X),cons(Y,Z))) -> mark(sel(X,Z))
     active(indx(nil(),X)) -> mark(nil())
     active(indx(cons(X,Y),Z)) -> mark(cons(sel(X,Z),indx(Y,Z)))
     active(from(X)) -> mark(cons(X,from(s(X))))
     mark(dbl(X)) -> active(dbl(mark(X)))
     mark(0()) -> active(0())
     mark(s(X)) -> active(s(X))
     mark(dbls(X)) -> active(dbls(mark(X)))
     mark(nil()) -> active(nil())
     mark(cons(X1,X2)) -> active(cons(X1,X2))
     mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
     mark(indx(X1,X2)) -> active(indx(mark(X1),X2))
     mark(from(X)) -> active(from(X))
     dbl(mark(X)) -> dbl(X)
     dbl(active(X)) -> dbl(X)
     s(mark(X)) -> s(X)
     s(active(X)) -> s(X)
     dbls(mark(X)) -> dbls(X)
     dbls(active(X)) -> dbls(X)
     cons(mark(X1),X2) -> cons(X1,X2)
     cons(X1,mark(X2)) -> cons(X1,X2)
     cons(active(X1),X2) -> cons(X1,X2)
     cons(X1,active(X2)) -> cons(X1,X2)
     sel(mark(X1),X2) -> sel(X1,X2)
     sel(X1,mark(X2)) -> sel(X1,X2)
     sel(active(X1),X2) -> sel(X1,X2)
     sel(X1,active(X2)) -> sel(X1,X2)
     indx(mark(X1),X2) -> indx(X1,X2)
     indx(X1,mark(X2)) -> indx(X1,X2)
     indx(active(X1),X2) -> indx(X1,X2)
     indx(X1,active(X2)) -> indx(X1,X2)
     from(mark(X)) -> from(X)
     from(active(X)) -> from(X)
    Open
    
    DPs:
     from#(mark(X)) -> from#(X)
     from#(active(X)) -> from#(X)
    TRS:
     active(dbl(0())) -> mark(0())
     active(dbl(s(X))) -> mark(s(s(dbl(X))))
     active(dbls(nil())) -> mark(nil())
     active(dbls(cons(X,Y))) -> mark(cons(dbl(X),dbls(Y)))
     active(sel(0(),cons(X,Y))) -> mark(X)
     active(sel(s(X),cons(Y,Z))) -> mark(sel(X,Z))
     active(indx(nil(),X)) -> mark(nil())
     active(indx(cons(X,Y),Z)) -> mark(cons(sel(X,Z),indx(Y,Z)))
     active(from(X)) -> mark(cons(X,from(s(X))))
     mark(dbl(X)) -> active(dbl(mark(X)))
     mark(0()) -> active(0())
     mark(s(X)) -> active(s(X))
     mark(dbls(X)) -> active(dbls(mark(X)))
     mark(nil()) -> active(nil())
     mark(cons(X1,X2)) -> active(cons(X1,X2))
     mark(sel(X1,X2)) -> active(sel(mark(X1),mark(X2)))
     mark(indx(X1,X2)) -> active(indx(mark(X1),X2))
     mark(from(X)) -> active(from(X))
     dbl(mark(X)) -> dbl(X)
     dbl(active(X)) -> dbl(X)
     s(mark(X)) -> s(X)
     s(active(X)) -> s(X)
     dbls(mark(X)) -> dbls(X)
     dbls(active(X)) -> dbls(X)
     cons(mark(X1),X2) -> cons(X1,X2)
     cons(X1,mark(X2)) -> cons(X1,X2)
     cons(active(X1),X2) -> cons(X1,X2)
     cons(X1,active(X2)) -> cons(X1,X2)
     sel(mark(X1),X2) -> sel(X1,X2)
     sel(X1,mark(X2)) -> sel(X1,X2)
     sel(active(X1),X2) -> sel(X1,X2)
     sel(X1,active(X2)) -> sel(X1,X2)
     indx(mark(X1),X2) -> indx(X1,X2)
     indx(X1,mark(X2)) -> indx(X1,X2)
     indx(active(X1),X2) -> indx(X1,X2)
     indx(X1,active(X2)) -> indx(X1,X2)
     from(mark(X)) -> from(X)
     from(active(X)) -> from(X)
    Open