YES
O(n^3)
TRS:
 {
     a__h(X) -> h(X),
   a__h(d()) -> a__g(c()),
     a__g(X) -> a__h(X),
     a__g(X) -> g(X),
      a__c() -> d(),
      a__c() -> c(),
   mark(d()) -> d(),
   mark(c()) -> a__c(),
  mark(g(X)) -> a__g(X),
  mark(h(X)) -> a__h(X)
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
       a__h(X) -> h(X),
     a__h(d()) -> a__g(c()),
       a__g(X) -> a__h(X),
       a__g(X) -> g(X),
        a__c() -> d(),
        a__c() -> c(),
     mark(d()) -> d(),
     mark(c()) -> a__c(),
    mark(g(X)) -> a__g(X),
    mark(h(X)) -> a__h(X)
   }
  Matrix Interpretation:
   Interpretation class: triangular
       [X2]    [1 0 0][X2]   [0]
   [h]([X1]) = [0 0 0][X1] + [0]
       [X0]    [0 0 0][X0]   [0]
   
       [X2]    [1 0 0][X2]   [0]
   [g]([X1]) = [0 0 0][X1] + [0]
       [X0]    [0 0 0][X0]   [0]
   
          [X2]    [1 1 0][X2]   [3]
   [mark]([X1]) = [0 0 0][X1] + [2]
          [X0]    [0 0 0][X0]   [0]
   
         [0]
   [c] = [1]
         [0]
   
            [3]
   [a__c] = [2]
            [0]
   
         [2]
   [d] = [0]
         [0]
   
          [X2]    [1 0 0][X2]   [2]
   [a__g]([X1]) = [0 0 0][X1] + [0]
          [X0]    [0 0 0][X0]   [0]
   
          [X2]    [1 0 0][X2]   [1]
   [a__h]([X1]) = [0 0 0][X1] + [0]
          [X0]    [0 0 0][X0]   [0]
   
   
   Qed