YES
O(n^2)
TRS:
 {f(c(X, s(Y))) -> f(c(s(X), Y)),
  g(c(s(X), Y)) -> f(c(X, s(Y)))}
 Natural interpretation:
  Strict:
   {f(c(X, s(Y))) -> f(c(s(X), Y)),
    g(c(s(X), Y)) -> f(c(X, s(Y)))}
  Weak:
   {}
  Interpretation class: deltarestricted
  [g](delta, X0) = + 1*X0 + 0 + 3*X0*delta + 2*delta
  [s](delta, X0) = + 1*X0 + 1 + 0*X0*delta + 0*delta
  [c](delta, X1, X0) = + 0*X0 + 0*X1 + 0 + 2*X0*delta + 1*X1*delta + 0*delta
  [f](delta, X0) = + 1*X0 + 0 + 0*X0*delta + 0*delta
  g_tau_1(delta) = delta/(1 + 3 * delta)
  s_tau_1(delta) = delta/(1 + 0 * delta)
  c_tau_1(delta) = delta/(0 + 1 * delta)c_tau_2(delta) = delta/(0 + 2 * delta)
  f_tau_1(delta) = delta/(1 + 0 * delta)
  
  Qed