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