YES(?,O(n^2))

Problem:
 +(-(x,y),z) -> -(+(x,z),y)
 -(+(x,y),y) -> x

Proof:
 Matrix Interpretation Processor:
  dimension: 2
  interpretation:
                 [1  10]     [1 1]     [1]
   [+](x0, x1) = [0  1 ]x0 + [0 0]x1 + [0],
   
                           [0]
   [-](x0, x1) = x0 + x1 + [1]
  orientation:
                 [1  10]    [1  10]    [1 1]    [11]    [1  10]        [1 1]    [1]              
   +(-(x,y),z) = [0  1 ]x + [0  1 ]y + [0 0]z + [1 ] >= [0  1 ]x + y + [0 0]z + [1] = -(+(x,z),y)
   
                 [1  10]    [2 1]    [1]         
   -(+(x,y),y) = [0  1 ]x + [0 1]y + [1] >= x = x
  problem:
   
  Qed