YES(?,O(n^1))

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

Proof:
 Bounds Processor:
  bound: 1
  enrichment: match
  automaton:
   final states: {3,2}
   transitions:
    c1(4) -> 5*
    c1(6) -> 7*
    a1(5) -> 6*
    a0(1) -> 2*
    c0(1) -> 1*
    b0(1) -> 3*
    1 -> 4*
    7 -> 3*
  problem:
   
  Qed