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