YES
O(n)
TRS:
 {g(g(x)) -> f(x),
  f(f(x)) -> g(f(x))}
 Natural interpretation:
  Strict:
   {g(g(x)) -> f(x),
    f(f(x)) -> g(f(x))}
  Weak:
   {}
  Interpretation class: stronglylinear
  [f](X0) = + 1*X0 + 3
  [g](X0) = + 1*X0 + 2
  
  Qed