YES(?,O(n^1))

Problem:
 b(b(c(a(b(c(x1)))))) -> a(b(b(c(b(c(a(x1)))))))

Proof:
 Bounds Processor:
  bound: 0
  enrichment: match
  automaton:
   final states: {3}
   transitions:
    b0(2) -> 3*
    b0(1) -> 3*
    c0(2) -> 1*
    c0(1) -> 1*
    a0(2) -> 2*
    a0(1) -> 2*
  problem:
   
  Qed