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