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