MAYBE
MAYBE
TRS:
 {
     a__f(X) -> f(X),
  a__f(g(X)) -> g(X),
      a__c() -> a__f(g(c())),
      a__c() -> c(),
  mark(g(X)) -> g(X),
   mark(c()) -> a__c(),
  mark(f(X)) -> a__f(X)
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
       a__f(X) -> f(X),
    a__f(g(X)) -> g(X),
        a__c() -> a__f(g(c())),
        a__c() -> c(),
    mark(g(X)) -> g(X),
     mark(c()) -> a__c(),
    mark(f(X)) -> a__f(X)
   }
  Fail