A:= [[-5, 2, 3, 1, 4,-6], 
     [ 2, 3, 5, 1, 4, 6], 
     [ 2,-6, 3, 4, 1, 5], 
     [ 5, 1,-3,-4, 2, 6], 
     [ 1, 5, 2,-4, 3, 6], 
     [ 1, 2, 3, 5, 6, 4], 
     [ 4, 5, 6, 1, 2, 3]]: