MAYBE
* Step 1: Failure MAYBE
  + Considered Problem:
      - Strict TRS:
          active(f(X1,X2)) -> f(active(X1),X2)
          active(f(g(X),Y)) -> mark(f(X,f(g(X),Y)))
          active(g(X)) -> g(active(X))
          f(mark(X1),X2) -> mark(f(X1,X2))
          f(ok(X1),ok(X2)) -> ok(f(X1,X2))
          g(mark(X)) -> mark(g(X))
          g(ok(X)) -> ok(g(X))
          proper(f(X1,X2)) -> f(proper(X1),proper(X2))
          proper(g(X)) -> g(proper(X))
          top(mark(X)) -> top(proper(X))
          top(ok(X)) -> top(active(X))
      - Signature:
          {active/1,f/2,g/1,proper/1,top/1} / {mark/1,ok/1}
      - Obligation:
          innermost runtime complexity wrt. defined symbols {active,f,g,proper,top} and constructors {mark,ok}
  + Applied Processor:
      Ara {heuristics_ = NoHeuristics, minDegree = 1, maxDegree = 3, araTimeout = 60, araFindStrictRules = Nothing, araSmtSolver = Z3}
  + Details:
      The input can not be schown compatible.
MAYBE