MAYBE

'Pop* with parameter subtitution (timeout of 60.0 seconds)'
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Answer:           MAYBE
Input Problem:    innermost runtime-complexity with respect to
  Rules:
    {  nthtail(n, l) -> cond(ge(n, length(l)), n, l)
     , cond(true(), n, l) -> l
     , cond(false(), n, l) -> tail(nthtail(s(n), l))
     , tail(nil()) -> nil()
     , tail(cons(x, l)) -> l
     , length(nil()) -> 0()
     , length(cons(x, l)) -> s(length(l))
     , ge(u, 0()) -> true()
     , ge(0(), s(v)) -> false()
     , ge(s(u), s(v)) -> ge(u, v)}

Proof Output:    
  The input cannot be shown compatible