B = 1 1 1 1 1 1 1 1 1 1 1 1 AB_r=[A;B] AB_r = 1 4 7 0 0 222 2 5 8 0 0 222 3 6 9 0 0 222 0 0 0 0 0 222 0 0 0 0 111 222 1 1 1 1 1 1 |