4 a 1 2 9 July 8, 2019 16 32 64 128 4 1 2 9 10 4 1 2 9 16 4 1 2 90 4 1 2 9 3 8 4 1 2 9 5 4 1 2 9 3 4 x 1 2 9 4 1 9 2 5 6 4 2 1 9 7 4 2 1 9 7 6 4 8 1 2 9 4 2 1 9 7 5 4 5 x 1 2 9 4 5 1 9 2 3 4 1 2 5 9 8