MAYBE
* Step 1: Failure MAYBE
  + Considered Problem:
      - Strict TRS:
          a__after(X1,X2) -> after(X1,X2)
          a__after(0(),XS) -> mark(XS)
          a__after(s(N),cons(X,XS)) -> a__after(mark(N),mark(XS))
          a__from(X) -> cons(mark(X),from(s(X)))
          a__from(X) -> from(X)
          mark(0()) -> 0()
          mark(after(X1,X2)) -> a__after(mark(X1),mark(X2))
          mark(cons(X1,X2)) -> cons(mark(X1),X2)
          mark(from(X)) -> a__from(mark(X))
          mark(s(X)) -> s(mark(X))
      - Signature:
          {a__after/2,a__from/1,mark/1} / {0/0,after/2,cons/2,from/1,s/1}
      - Obligation:
          innermost runtime complexity wrt. defined symbols {a__after,a__from,mark} and constructors {0,after,cons
          ,from,s}
  + Applied Processor:
      NaturalPI {shape = Mixed 3, restrict = NoRestrict, uargs = UArgs, urules = URules, selector = Nothing}
  + Details:
      Incompatible
MAYBE