4 3 4 2 7 9 July 8, 2019 16 32 64 128 1 3 4 2 7 9 7 3 4 x 2 4 9 4 3 5 2 7 9 4 3 7 5x 1 2 4 9 )- 1 5 4 3 7 5 * x 1 2 4 9 1 5
