1 3 6 8 12 July 8, 2019 16 32 64 128 1 3 6 8 12 puzzle 1 3 6 8 12 boat 1 3 6 8 12 river crossing 1 3 12 x )=- 8 6 x 3 6 12 minus 1 8 12 The difference of 1 2 3 6 8 and 1256 is the set 10x 3 12 1 6 8 x phần 9
