MAYBE
Time: 0.038535
TRS:
 {f(x, f(f(f(a(), a()), a()), a())) -> f(f(x, a()), x)}
 DP:
  DP:
   {f#(x, f(f(f(a(), a()), a()), a())) -> f#(x, a()),
    f#(x, f(f(f(a(), a()), a()), a())) -> f#(f(x, a()), x)}
  TRS:
  {f(x, f(f(f(a(), a()), a()), a())) -> f(f(x, a()), x)}
  EDG:
   {(f#(x, f(f(f(a(), a()), a()), a())) -> f#(f(x, a()), x), f#(x, f(f(f(a(), a()), a()), a())) -> f#(x, a()))
    (f#(x, f(f(f(a(), a()), a()), a())) -> f#(f(x, a()), x), f#(x, f(f(f(a(), a()), a()), a())) -> f#(f(x, a()), x))}
   STATUS:
    arrows: 0.500000
    SCCS (1):
     Scc:
      {f#(x, f(f(f(a(), a()), a()), a())) -> f#(f(x, a()), x)}
     
     SCC (1):
      Strict:
       {f#(x, f(f(f(a(), a()), a()), a())) -> f#(f(x, a()), x)}
      Weak:
      {f(x, f(f(f(a(), a()), a()), a())) -> f(f(x, a()), x)}
      Fail