MAYBE
* Step 1: Failure MAYBE
  + Considered Problem:
      - Strict TRS:
          active(f(X)) -> f(active(X))
          active(f(X)) -> mark(if(X,c(),f(true())))
          active(if(X1,X2,X3)) -> if(X1,active(X2),X3)
          active(if(X1,X2,X3)) -> if(active(X1),X2,X3)
          active(if(false(),X,Y)) -> mark(Y)
          active(if(true(),X,Y)) -> mark(X)
          f(mark(X)) -> mark(f(X))
          f(ok(X)) -> ok(f(X))
          if(X1,mark(X2),X3) -> mark(if(X1,X2,X3))
          if(mark(X1),X2,X3) -> mark(if(X1,X2,X3))
          if(ok(X1),ok(X2),ok(X3)) -> ok(if(X1,X2,X3))
          proper(c()) -> ok(c())
          proper(f(X)) -> f(proper(X))
          proper(false()) -> ok(false())
          proper(if(X1,X2,X3)) -> if(proper(X1),proper(X2),proper(X3))
          proper(true()) -> ok(true())
          top(mark(X)) -> top(proper(X))
          top(ok(X)) -> top(active(X))
      - Signature:
          {active/1,f/1,if/3,proper/1,top/1} / {c/0,false/0,mark/1,ok/1,true/0}
      - Obligation:
          innermost runtime complexity wrt. defined symbols {active,f,if,proper,top} and constructors {c,false,mark,ok
          ,true}
  + Applied Processor:
      MI {miKind = Automaton Nothing, miDimension = 3, miUArgs = NoUArgs, miURules = NoURules, miSelector = Nothing}
  + Details:
      Incompatible
MAYBE