MAYBE
TRS:
 {f(f(a(), x), a()) -> f(f(x, f(a(), a())), a())}
 DP:
  Strict:
   {f#(f(a(), x), a()) -> f#(x, f(a(), a())),
    f#(f(a(), x), a()) -> f#(f(x, f(a(), a())), a()),
    f#(f(a(), x), a()) -> f#(a(), a())}
  Weak:
  {f(f(a(), x), a()) -> f(f(x, f(a(), a())), a())}
  EDG:
   {(f#(f(a(), x), a()) -> f#(f(x, f(a(), a())), a()), f#(f(a(), x), a()) -> f#(x, f(a(), a())))
    (f#(f(a(), x), a()) -> f#(f(x, f(a(), a())), a()), f#(f(a(), x), a()) -> f#(f(x, f(a(), a())), a()))
    (f#(f(a(), x), a()) -> f#(f(x, f(a(), a())), a()), f#(f(a(), x), a()) -> f#(a(), a()))}
   SCCS:
    Scc:
     {f#(f(a(), x), a()) -> f#(f(x, f(a(), a())), a())}
    SCC:
     Strict:
      {f#(f(a(), x), a()) -> f#(f(x, f(a(), a())), a())}
     Weak:
     {f(f(a(), x), a()) -> f(f(x, f(a(), a())), a())}
     Fail