4 9 3 27 July 8, 2019 16 32 64 128 4 3 27 9 5 3 4 9 2 27 4 9 x 3 27 4 weights 1 3 9 27 3 2x 9 3 27 4 4 27 3 1 9 27x 9 3 4 9 7 3 4 27