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