Akm = {{0, 0, A(0,0)} , 
       {2, 0, A(2,0)} , 
       {4, 0, A(4,0)} , 
       {5,-5, (-1)*(A(5,5))} , 
       {5, 5, A(5,5)} , 
       {6, 0, A(6,0)} }