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