MAYBE
Time: 0.005779
TRS:
 {f(x, f(a(), y)) -> f(f(y, f(f(a(), a()), a())), x)}
 DP:
  DP:
   {f#(x, f(a(), y)) -> f#(y, f(f(a(), a()), a())),
    f#(x, f(a(), y)) -> f#(f(y, f(f(a(), a()), a())), x),
    f#(x, f(a(), y)) -> f#(f(a(), a()), a()),
    f#(x, f(a(), y)) -> f#(a(), a())}
  TRS:
  {f(x, f(a(), y)) -> f(f(y, f(f(a(), a()), a())), x)}
  EDG:
   {(f#(x, f(a(), y)) -> f#(f(y, f(f(a(), a()), a())), x), f#(x, f(a(), y)) -> f#(y, f(f(a(), a()), a())))
    (f#(x, f(a(), y)) -> f#(f(y, f(f(a(), a()), a())), x), f#(x, f(a(), y)) -> f#(f(y, f(f(a(), a()), a())), x))
    (f#(x, f(a(), y)) -> f#(f(y, f(f(a(), a()), a())), x), f#(x, f(a(), y)) -> f#(f(a(), a()), a()))
    (f#(x, f(a(), y)) -> f#(f(y, f(f(a(), a()), a())), x), f#(x, f(a(), y)) -> f#(a(), a()))}
   SCCS (1):
    Scc:
     {f#(x, f(a(), y)) -> f#(f(y, f(f(a(), a()), a())), x)}
    SCC (1):
     Strict:
      {f#(x, f(a(), y)) -> f#(f(y, f(f(a(), a()), a())), x)}
     Weak:
     {f(x, f(a(), y)) -> f(f(y, f(f(a(), a()), a())), x)}
     Fail