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