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