4 7 x 28 1 July 8, 2019 16 32 64 128 4 7 x 28 16 4 7 28 x 18 7 05 * 12 4 x 28 5 X 1 x 4 x 7 x 28 155 X 1 x 4 x 7 x 28 195 1 4 7 10 x 28 1 2 4 7 28 x y 1 4 x 22 7 x 28 X 7 x 14 x 28 1 4 1 4 28 x 7 8 15 4 7 12 x 3 28 3 7 1 4 x 28 28 x 1 )= 7 4x 4