YES
O(n^2)
TRS:
 {
  f(c(s(x), y)) -> f(c(x, s(y))),
  g(c(x, s(y))) -> g(c(s(x), y)),
     g(s(f(x))) -> g(f(x))
 }
 DUP: We consider a non-duplicating system.
  Trs:
   {
    f(c(s(x), y)) -> f(c(x, s(y))),
    g(c(x, s(y))) -> g(c(s(x), y)),
       g(s(f(x))) -> g(f(x))
   }
  Matrix Interpretation:
   Interpretation class: triangular
       [X1]    [1 0][X1]   [0]
   [g]([X0]) = [0 0][X0] + [0]
   
       [X1]    [1 0][X1]   [3]
   [s]([X0]) = [0 1][X0] + [3]
   
       [X3]  [X1]    [1 0][X3]   [1 2][X1]   [0]
   [c]([X2], [X0]) = [0 1][X2] + [0 0][X0] + [0]
   
       [X1]    [1 3][X1]   [0]
   [f]([X0]) = [0 0][X0] + [0]
   
   
   Qed