(VAR X Y Z X1 X2) (RULES 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)))) active(dbl1(0)) -> mark(01) active(dbl1(s(X))) -> mark(s1(s1(dbl1(X)))) active(sel1(0,cons(X,Y))) -> mark(X) active(sel1(s(X),cons(Y,Z))) -> mark(sel1(X,Z)) active(quote(0)) -> mark(01) active(quote(s(X))) -> mark(s1(quote(X))) active(quote(dbl(X))) -> mark(dbl1(X)) active(quote(sel(X,Y))) -> mark(sel1(X,Y)) 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)) mark(dbl1(X)) -> active(dbl1(mark(X))) mark(01) -> active(01) mark(s1(X)) -> active(s1(mark(X))) mark(sel1(X1,X2)) -> active(sel1(mark(X1),mark(X2))) mark(quote(X)) -> active(quote(mark(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) dbl1(mark(X)) -> dbl1(X) dbl1(active(X)) -> dbl1(X) s1(mark(X)) -> s1(X) s1(active(X)) -> s1(X) sel1(mark(X1),X2) -> sel1(X1,X2) sel1(X1,mark(X2)) -> sel1(X1,X2) sel1(active(X1),X2) -> sel1(X1,X2) sel1(X1,active(X2)) -> sel1(X1,X2) quote(mark(X)) -> quote(X) quote(active(X)) -> quote(X) )