3 1 6 8 July 8, 2019 16 32 64 128 3 1 6 8 2 9 1 3 6 8 12 puzzle 1 3 6 8 tetrabromopyrene 1 3 6 8 pyrenetetrasulfonic acid tetrasodium salt 1 3 6 8 9 1 3 6 8 11 sequence 1 3 6 8 10 1 3 6 8-pyrenetetra sulfonic acid 1 3 6 8 11 1 3 6 8 7 1 3 6 8 4 3 1 8x 6 1 3 6 8 5 3 1 6 x 8 1 3 8 6 spline pto shaft
