1 3 13 4 7 July 8, 2019 16 32 64 128 4 7 1 3 z 13 14 5 8 3 4 7 x 1 13 15 1 7x 4 3 )- 13 13 4 5x 1 )= 3 7 5x )- 15 13 3 4 x 7 1 4