MAYBE

We are left with following problem, upon which TcT provides the
certificate MAYBE.

Strict Trs:
  { a__from(X) -> cons(mark(X), from(s(X)))
  , a__from(X) -> from(X)
  , mark(cons(X1, X2)) -> cons(mark(X1), X2)
  , mark(from(X)) -> a__from(mark(X))
  , mark(s(X)) -> s(mark(X))
  , mark(0()) -> 0()
  , mark(nil()) -> nil()
  , mark(take(X1, X2)) -> a__take(mark(X1), mark(X2))
  , mark(head(X)) -> a__head(mark(X))
  , mark(2nd(X)) -> a__2nd(mark(X))
  , mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2))
  , a__head(X) -> head(X)
  , a__head(cons(X, XS)) -> mark(X)
  , a__2nd(X) -> 2nd(X)
  , a__2nd(cons(X, XS)) -> a__head(mark(XS))
  , a__take(X1, X2) -> take(X1, X2)
  , a__take(s(N), cons(X, XS)) -> cons(mark(X), take(N, XS))
  , a__take(0(), XS) -> nil()
  , a__sel(X1, X2) -> sel(X1, X2)
  , a__sel(s(N), cons(X, XS)) -> a__sel(mark(N), mark(XS))
  , a__sel(0(), cons(X, XS)) -> mark(X) }
Obligation:
  runtime complexity
Answer:
  MAYBE

None of the processors succeeded.

Details of failed attempt(s):
-----------------------------
1) 'WithProblem (timeout of 60 seconds)' failed due to the
   following reason:
   
   Computation stopped due to timeout after 60.0 seconds.

2) 'Best' failed due to the following reason:
   
   None of the processors succeeded.
   
   Details of failed attempt(s):
   -----------------------------
   1) 'WithProblem (timeout of 30 seconds) (timeout of 60 seconds)'
      failed due to the following reason:
      
      Computation stopped due to timeout after 30.0 seconds.
   
   2) 'Fastest (timeout of 5 seconds) (timeout of 60 seconds)' failed
      due to the following reason:
      
      None of the processors succeeded.
      
      Details of failed attempt(s):
      -----------------------------
      1) 'Bounds with perSymbol-enrichment and initial automaton 'match''
         failed due to the following reason:
         
         match-boundness of the problem could not be verified.
      
      2) 'Bounds with minimal-enrichment and initial automaton 'match''
         failed due to the following reason:
         
         match-boundness of the problem could not be verified.
      
   
   3) 'Best' failed due to the following reason:
      
      None of the processors succeeded.
      
      Details of failed attempt(s):
      -----------------------------
      1) 'Polynomial Path Order (PS) (timeout of 60 seconds)' failed due
         to the following reason:
         
         The processor is inapplicable, reason:
           Processor only applicable for innermost runtime complexity analysis
      
      2) 'bsearch-popstar (timeout of 60 seconds)' failed due to the
         following reason:
         
         The processor is inapplicable, reason:
           Processor only applicable for innermost runtime complexity analysis
      
   

3) 'Innermost Weak Dependency Pairs (timeout of 60 seconds)' failed
   due to the following reason:
   
   We add the following weak dependency pairs:
   
   Strict DPs:
     { a__from^#(X) -> c_1(mark^#(X), X)
     , a__from^#(X) -> c_2(X)
     , mark^#(cons(X1, X2)) -> c_3(mark^#(X1), X2)
     , mark^#(from(X)) -> c_4(a__from^#(mark(X)))
     , mark^#(s(X)) -> c_5(mark^#(X))
     , mark^#(0()) -> c_6()
     , mark^#(nil()) -> c_7()
     , mark^#(take(X1, X2)) -> c_8(a__take^#(mark(X1), mark(X2)))
     , mark^#(head(X)) -> c_9(a__head^#(mark(X)))
     , mark^#(2nd(X)) -> c_10(a__2nd^#(mark(X)))
     , mark^#(sel(X1, X2)) -> c_11(a__sel^#(mark(X1), mark(X2)))
     , a__take^#(X1, X2) -> c_16(X1, X2)
     , a__take^#(s(N), cons(X, XS)) -> c_17(mark^#(X), N, XS)
     , a__take^#(0(), XS) -> c_18()
     , a__head^#(X) -> c_12(X)
     , a__head^#(cons(X, XS)) -> c_13(mark^#(X))
     , a__2nd^#(X) -> c_14(X)
     , a__2nd^#(cons(X, XS)) -> c_15(a__head^#(mark(XS)))
     , a__sel^#(X1, X2) -> c_19(X1, X2)
     , a__sel^#(s(N), cons(X, XS)) -> c_20(a__sel^#(mark(N), mark(XS)))
     , a__sel^#(0(), cons(X, XS)) -> c_21(mark^#(X)) }
   
   and mark the set of starting terms.
   
   We are left with following problem, upon which TcT provides the
   certificate MAYBE.
   
   Strict DPs:
     { a__from^#(X) -> c_1(mark^#(X), X)
     , a__from^#(X) -> c_2(X)
     , mark^#(cons(X1, X2)) -> c_3(mark^#(X1), X2)
     , mark^#(from(X)) -> c_4(a__from^#(mark(X)))
     , mark^#(s(X)) -> c_5(mark^#(X))
     , mark^#(0()) -> c_6()
     , mark^#(nil()) -> c_7()
     , mark^#(take(X1, X2)) -> c_8(a__take^#(mark(X1), mark(X2)))
     , mark^#(head(X)) -> c_9(a__head^#(mark(X)))
     , mark^#(2nd(X)) -> c_10(a__2nd^#(mark(X)))
     , mark^#(sel(X1, X2)) -> c_11(a__sel^#(mark(X1), mark(X2)))
     , a__take^#(X1, X2) -> c_16(X1, X2)
     , a__take^#(s(N), cons(X, XS)) -> c_17(mark^#(X), N, XS)
     , a__take^#(0(), XS) -> c_18()
     , a__head^#(X) -> c_12(X)
     , a__head^#(cons(X, XS)) -> c_13(mark^#(X))
     , a__2nd^#(X) -> c_14(X)
     , a__2nd^#(cons(X, XS)) -> c_15(a__head^#(mark(XS)))
     , a__sel^#(X1, X2) -> c_19(X1, X2)
     , a__sel^#(s(N), cons(X, XS)) -> c_20(a__sel^#(mark(N), mark(XS)))
     , a__sel^#(0(), cons(X, XS)) -> c_21(mark^#(X)) }
   Strict Trs:
     { a__from(X) -> cons(mark(X), from(s(X)))
     , a__from(X) -> from(X)
     , mark(cons(X1, X2)) -> cons(mark(X1), X2)
     , mark(from(X)) -> a__from(mark(X))
     , mark(s(X)) -> s(mark(X))
     , mark(0()) -> 0()
     , mark(nil()) -> nil()
     , mark(take(X1, X2)) -> a__take(mark(X1), mark(X2))
     , mark(head(X)) -> a__head(mark(X))
     , mark(2nd(X)) -> a__2nd(mark(X))
     , mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2))
     , a__head(X) -> head(X)
     , a__head(cons(X, XS)) -> mark(X)
     , a__2nd(X) -> 2nd(X)
     , a__2nd(cons(X, XS)) -> a__head(mark(XS))
     , a__take(X1, X2) -> take(X1, X2)
     , a__take(s(N), cons(X, XS)) -> cons(mark(X), take(N, XS))
     , a__take(0(), XS) -> nil()
     , a__sel(X1, X2) -> sel(X1, X2)
     , a__sel(s(N), cons(X, XS)) -> a__sel(mark(N), mark(XS))
     , a__sel(0(), cons(X, XS)) -> mark(X) }
   Obligation:
     runtime complexity
   Answer:
     MAYBE
   
   We estimate the number of application of {6,7,14} by applications
   of Pre({6,7,14}) = {1,2,3,5,8,12,13,15,16,17,19,21}. Here rules are
   labeled as follows:
   
     DPs:
       { 1: a__from^#(X) -> c_1(mark^#(X), X)
       , 2: a__from^#(X) -> c_2(X)
       , 3: mark^#(cons(X1, X2)) -> c_3(mark^#(X1), X2)
       , 4: mark^#(from(X)) -> c_4(a__from^#(mark(X)))
       , 5: mark^#(s(X)) -> c_5(mark^#(X))
       , 6: mark^#(0()) -> c_6()
       , 7: mark^#(nil()) -> c_7()
       , 8: mark^#(take(X1, X2)) -> c_8(a__take^#(mark(X1), mark(X2)))
       , 9: mark^#(head(X)) -> c_9(a__head^#(mark(X)))
       , 10: mark^#(2nd(X)) -> c_10(a__2nd^#(mark(X)))
       , 11: mark^#(sel(X1, X2)) -> c_11(a__sel^#(mark(X1), mark(X2)))
       , 12: a__take^#(X1, X2) -> c_16(X1, X2)
       , 13: a__take^#(s(N), cons(X, XS)) -> c_17(mark^#(X), N, XS)
       , 14: a__take^#(0(), XS) -> c_18()
       , 15: a__head^#(X) -> c_12(X)
       , 16: a__head^#(cons(X, XS)) -> c_13(mark^#(X))
       , 17: a__2nd^#(X) -> c_14(X)
       , 18: a__2nd^#(cons(X, XS)) -> c_15(a__head^#(mark(XS)))
       , 19: a__sel^#(X1, X2) -> c_19(X1, X2)
       , 20: a__sel^#(s(N), cons(X, XS)) ->
             c_20(a__sel^#(mark(N), mark(XS)))
       , 21: a__sel^#(0(), cons(X, XS)) -> c_21(mark^#(X)) }
   
   We are left with following problem, upon which TcT provides the
   certificate MAYBE.
   
   Strict DPs:
     { a__from^#(X) -> c_1(mark^#(X), X)
     , a__from^#(X) -> c_2(X)
     , mark^#(cons(X1, X2)) -> c_3(mark^#(X1), X2)
     , mark^#(from(X)) -> c_4(a__from^#(mark(X)))
     , mark^#(s(X)) -> c_5(mark^#(X))
     , mark^#(take(X1, X2)) -> c_8(a__take^#(mark(X1), mark(X2)))
     , mark^#(head(X)) -> c_9(a__head^#(mark(X)))
     , mark^#(2nd(X)) -> c_10(a__2nd^#(mark(X)))
     , mark^#(sel(X1, X2)) -> c_11(a__sel^#(mark(X1), mark(X2)))
     , a__take^#(X1, X2) -> c_16(X1, X2)
     , a__take^#(s(N), cons(X, XS)) -> c_17(mark^#(X), N, XS)
     , a__head^#(X) -> c_12(X)
     , a__head^#(cons(X, XS)) -> c_13(mark^#(X))
     , a__2nd^#(X) -> c_14(X)
     , a__2nd^#(cons(X, XS)) -> c_15(a__head^#(mark(XS)))
     , a__sel^#(X1, X2) -> c_19(X1, X2)
     , a__sel^#(s(N), cons(X, XS)) -> c_20(a__sel^#(mark(N), mark(XS)))
     , a__sel^#(0(), cons(X, XS)) -> c_21(mark^#(X)) }
   Strict Trs:
     { a__from(X) -> cons(mark(X), from(s(X)))
     , a__from(X) -> from(X)
     , mark(cons(X1, X2)) -> cons(mark(X1), X2)
     , mark(from(X)) -> a__from(mark(X))
     , mark(s(X)) -> s(mark(X))
     , mark(0()) -> 0()
     , mark(nil()) -> nil()
     , mark(take(X1, X2)) -> a__take(mark(X1), mark(X2))
     , mark(head(X)) -> a__head(mark(X))
     , mark(2nd(X)) -> a__2nd(mark(X))
     , mark(sel(X1, X2)) -> a__sel(mark(X1), mark(X2))
     , a__head(X) -> head(X)
     , a__head(cons(X, XS)) -> mark(X)
     , a__2nd(X) -> 2nd(X)
     , a__2nd(cons(X, XS)) -> a__head(mark(XS))
     , a__take(X1, X2) -> take(X1, X2)
     , a__take(s(N), cons(X, XS)) -> cons(mark(X), take(N, XS))
     , a__take(0(), XS) -> nil()
     , a__sel(X1, X2) -> sel(X1, X2)
     , a__sel(s(N), cons(X, XS)) -> a__sel(mark(N), mark(XS))
     , a__sel(0(), cons(X, XS)) -> mark(X) }
   Weak DPs:
     { mark^#(0()) -> c_6()
     , mark^#(nil()) -> c_7()
     , a__take^#(0(), XS) -> c_18() }
   Obligation:
     runtime complexity
   Answer:
     MAYBE
   
   Empty strict component of the problem is NOT empty.


Arrrr..