YES
Input TRS:
      1: a(b(b(b(a(x1))))) -> x1
      2: x1 ->= a(b(a(x1)))
Number of strict rules: 1
Direct POLO(bPol) ... failed.
Uncurrying ... failed.
Dependency Pairs:
     #1: #x1 ->? #a(b(a(x1)))
     #2: #x1 ->? #a(x1)
Number of SCCs: 0, DPs: 0