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