MAYBE
Time: 0.000642
TRS:
 {f(f(x, a()), y) -> f(y, f(x, y))}
 DP:
  DP:
   {f#(f(x, a()), y) -> f#(y, f(x, y)),
    f#(f(x, a()), y) -> f#(x, y)}
  TRS:
  {f(f(x, a()), y) -> f(y, f(x, y))}
  EDG:
   {(f#(f(x, a()), y) -> f#(x, y), f#(f(x, a()), y) -> f#(x, y))
    (f#(f(x, a()), y) -> f#(x, y), f#(f(x, a()), y) -> f#(y, f(x, y)))
    (f#(f(x, a()), y) -> f#(y, f(x, y)), f#(f(x, a()), y) -> f#(y, f(x, y)))
    (f#(f(x, a()), y) -> f#(y, f(x, y)), f#(f(x, a()), y) -> f#(x, y))}
   STATUS:
    arrows: 0.000000
    SCCS (1):
     Scc:
      {f#(f(x, a()), y) -> f#(y, f(x, y)),
       f#(f(x, a()), y) -> f#(x, y)}
     
     SCC (2):
      Strict:
       {f#(f(x, a()), y) -> f#(y, f(x, y)),
        f#(f(x, a()), y) -> f#(x, y)}
      Weak:
      {f(f(x, a()), y) -> f(y, f(x, y))}
      Open