YES(?,O(n^3))

Problem:
 f(x,f(f(a(),a()),a())) -> f(f(a(),f(a(),a())),x)

Proof:
 Complexity Transformation Processor:
  strict:
   f(x,f(f(a(),a()),a())) -> f(f(a(),f(a(),a())),x)
  weak:
   
  Matrix Interpretation Processor:
   dimension: 3
   max_matrix:
    [1 1 0]
    [0 1 1]
    [0 0 0]
    interpretation:
                   [1 1 0]     [1 1 0]     [0]
     [f](x0, x1) = [0 1 1]x0 + [0 1 0]x1 + [0]
                   [0 0 0]     [0 0 0]     [1],
     
           [0]
     [a] = [0]
           [0]
    orientation:
                              [1 1 0]    [1]    [1 1 0]    [0]                         
     f(x,f(f(a(),a()),a())) = [0 1 1]x + [1] >= [0 1 0]x + [1] = f(f(a(),f(a(),a())),x)
                              [0 0 0]    [1]    [0 0 0]    [1]                         
    problem:
     strict:
      
     weak:
      f(x,f(f(a(),a()),a())) -> f(f(a(),f(a(),a())),x)
    Qed