MAYBE
Input TRS:
      1: b(a(b(b(x1)))) -> b(b(b(a(b(x1)))))
      2: b(a(a(b(b(x1))))) -> b(a(b(b(a(a(b(x1)))))))
      3: b(a(a(a(b(b(x1)))))) -> b(a(a(b(b(a(a(a(b(x1)))))))))
      4: b(a(a(a(a(b(b(x1))))))) -> b(a(a(a(b(b(a(a(a(a(b(x1)))))))))))
Number of strict rules: 4
Direct POLO(bPol) ... failed.
Uncurrying ... failed.
Dependency Pairs:
     #1: #b(a(a(b(b(x1))))) -> #b(a(b(b(a(a(b(x1)))))))
     #2: #b(a(a(b(b(x1))))) -> #b(b(a(a(b(x1)))))
     #3: #b(a(a(b(b(x1))))) -> #b(a(a(b(x1))))
     #4: #b(a(a(a(b(b(x1)))))) -> #b(a(a(b(b(a(a(a(b(x1)))))))))
     #5: #b(a(a(a(b(b(x1)))))) -> #b(b(a(a(a(b(x1))))))
     #6: #b(a(a(a(b(b(x1)))))) -> #b(a(a(a(b(x1)))))
     #7: #b(a(b(b(x1)))) -> #b(b(b(a(b(x1)))))
     #8: #b(a(b(b(x1)))) -> #b(b(a(b(x1))))
     #9: #b(a(b(b(x1)))) -> #b(a(b(x1)))
     #10: #b(a(a(a(a(b(b(x1))))))) -> #b(a(a(a(b(b(a(a(a(a(b(x1)))))))))))
     #11: #b(a(a(a(a(b(b(x1))))))) -> #b(b(a(a(a(a(b(x1)))))))
     #12: #b(a(a(a(a(b(b(x1))))))) -> #b(a(a(a(a(b(x1))))))
Number of SCCs: 4, DPs: 4
  SCC { #9 }
POLO(Sum)... POLO(max)... QLPOS... POLO(mSum)... QWPOpS(mSum)... Mat2b... failed.
Finding a loop...  failed.