18 x 4 9 x 3 July 8, 2019 16 32 64 128 1 9 x 4 9 x 3 1 18 18 9 x (- 4 3 10 x 2 9 x 3 20 18 x 4 8 1 6 x 4 )- 4 9 x 3 )= 1 18 9 x 3 20 18 x 4
