MAYBE
Input TRS:
      1: a(x1) -> b(c(b(c(x1))))
      2: b(b(x1)) -> x1
      3: c(c(b(x1))) -> a(c(x1))
Number of strict rules: 3
Direct POLO(bPol) ... failed.
Uncurrying ... failed.
Dependency Pairs:
     #1: #c(c(b(x1))) -> #a(c(x1))
     #2: #c(c(b(x1))) -> #c(x1)
     #3: #a(x1) -> #b(c(b(c(x1))))
     #4: #a(x1) -> #c(b(c(x1)))
     #5: #a(x1) -> #b(c(x1))
     #6: #a(x1) -> #c(x1)
Number of SCCs: 1, DPs: 4
  SCC { #1 #2 #4 #6 }
POLO(Sum)... POLO(max)... QLPOS... POLO(mSum)... QWPOpS(mSum)... Mat2b... failed.
Finding a loop...  failed.