YES
TRS:
 {f(f(x, a()), a()) -> f(f(f(a(), a()), f(x, a())), a())}
 DP:
  Strict:
   {f#(f(x, a()), a()) -> f#(f(f(a(), a()), f(x, a())), a()),
    f#(f(x, a()), a()) -> f#(f(a(), a()), f(x, a())),
    f#(f(x, a()), a()) -> f#(a(), a())}
  Weak:
  {f(f(x, a()), a()) -> f(f(f(a(), a()), f(x, a())), a())}
  EDG:
   {(f#(f(x, a()), a()) -> f#(f(f(a(), a()), f(x, a())), a()), f#(f(x, a()), a()) -> f#(f(f(a(), a()), f(x, a())), a()))
    (f#(f(x, a()), a()) -> f#(f(f(a(), a()), f(x, a())), a()), f#(f(x, a()), a()) -> f#(f(a(), a()), f(x, a())))
    (f#(f(x, a()), a()) -> f#(f(f(a(), a()), f(x, a())), a()), f#(f(x, a()), a()) -> f#(a(), a()))}
   SCCS:
    Scc:
     {f#(f(x, a()), a()) -> f#(f(f(a(), a()), f(x, a())), a())}
    SCC:
     Strict:
      {f#(f(x, a()), a()) -> f#(f(f(a(), a()), f(x, a())), a())}
     Weak:
     {f(f(x, a()), a()) -> f(f(f(a(), a()), f(x, a())), a())}
     BOUND:
      Bound: match(-raise)-bounded by 0
      Automaton:
       {     b_0() -> 4*
             a_0() -> 2*
        f#_0(6, 2) -> 7*
         f_0(6, 2) -> 1*
         f_0(4, 2) -> 5*
         f_0(3, 5) -> 6*
         f_0(2, 2) -> 3*
                 1 -> 5*}
      Strict:
       {}
      Qed