YES
TRS:
 {f(x, f(f(a(), a()), a())) -> f(f(a(), f(a(), a())), x)}
 DP:
  Strict:
   {f#(x, f(f(a(), a()), a())) -> f#(f(a(), f(a(), a())), x),
    f#(x, f(f(a(), a()), a())) -> f#(a(), f(a(), a()))}
  Weak:
  {f(x, f(f(a(), a()), a())) -> f(f(a(), f(a(), a())), x)}
  EDG:
   {(f#(x, f(f(a(), a()), a())) -> f#(f(a(), f(a(), a())), x), f#(x, f(f(a(), a()), a())) -> f#(f(a(), f(a(), a())), x))
    (f#(x, f(f(a(), a()), a())) -> f#(f(a(), f(a(), a())), x), f#(x, f(f(a(), a()), a())) -> f#(a(), f(a(), a())))}
   SCCS:
    Scc:
     {f#(x, f(f(a(), a()), a())) -> f#(f(a(), f(a(), a())), x)}
    SCC:
     Strict:
      {f#(x, f(f(a(), a()), a())) -> f#(f(a(), f(a(), a())), x)}
     Weak:
     {f(x, f(f(a(), a()), a())) -> f(f(a(), f(a(), a())), x)}
     UR:
      {}
      BOUND:
       Bound: match(-raise)-bounded by 1
       Automaton:
        {     a_1() -> 2*
              a_0() -> 1*
         f#_1(4, 4) -> 1*
         f#_1(4, 1) -> 1*
         f#_0(1, 1) -> 1*
          f_1(2, 3) -> 4*
          f_1(2, 2) -> 3*
          f_0(1, 1) -> 1*}
       Strict:
        {}
       Qed