A = [ -4  1  0  5 -1
       5 -1 -2 -4 -2
       1  5 -4  1  5]

B = [ 1  3 -4  3 -2  1
      0  3  2  3 -1  4
      5  4  4  5 -1  0
     -4 -3  2  4  1  4]
 