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