MAYBE
Time: 0.042698
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)}
  UR:
   {b(y, z) -> y,
    b(y, z) -> z}
   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)}
       Open