0 1 5 x 15 July 8, 2019 16 32 64 128 X 15 0 3 1 5 1 x 9 0 x 5 x 15 9 1 4 5 =- 0 15 x 0 15x 1 15 5 75 x 1 5×0 15 0 5 × 1 5
