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