YES(?,O(n^1))

Problem:
 a(b(a(x))) -> b(a(x))

Proof:
 Complexity Transformation Processor:
  strict:
   a(b(a(x))) -> b(a(x))
  weak:
   
  Matrix Interpretation Processor:
   dimension: 1
   max_matrix:
    1
    interpretation:
     [b](x0) = x0 + 1,
     
     [a](x0) = x0 + 1
    orientation:
     a(b(a(x))) = x + 3 >= x + 2 = b(a(x))
    problem:
     strict:
      
     weak:
      a(b(a(x))) -> b(a(x))
    Qed