MAYBE
Time: 0.000590
TRS:
 {f(f(x, y, a()), z, w) -> f(z, w, f(y, x, z))}
 DP:
  DP:
   {f#(f(x, y, a()), z, w) -> f#(z, w, f(y, x, z)),
    f#(f(x, y, a()), z, w) -> f#(y, x, z)}
  TRS:
  {f(f(x, y, a()), z, w) -> f(z, w, f(y, x, z))}
  EDG:
   {(f#(f(x, y, a()), z, w) -> f#(z, w, f(y, x, z)), f#(f(x, y, a()), z, w) -> f#(y, x, z))
    (f#(f(x, y, a()), z, w) -> f#(z, w, f(y, x, z)), f#(f(x, y, a()), z, w) -> f#(z, w, f(y, x, z)))
    (f#(f(x, y, a()), z, w) -> f#(y, x, z), f#(f(x, y, a()), z, w) -> f#(z, w, f(y, x, z)))
    (f#(f(x, y, a()), z, w) -> f#(y, x, z), f#(f(x, y, a()), z, w) -> f#(y, x, z))}
   STATUS:
    arrows: 0.000000
    SCCS (1):
     Scc:
      {f#(f(x, y, a()), z, w) -> f#(z, w, f(y, x, z)),
       f#(f(x, y, a()), z, w) -> f#(y, x, z)}
     
     SCC (2):
      Strict:
       {f#(f(x, y, a()), z, w) -> f#(z, w, f(y, x, z)),
        f#(f(x, y, a()), z, w) -> f#(y, x, z)}
      Weak:
      {f(f(x, y, a()), z, w) -> f(z, w, f(y, x, z))}
      Open