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