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