B 1 2 6 5 1 3 July 8, 2019 16 32 64 128 1 6 b 5 b 1 2 2 3b B c 1 2 1 6 a b 1 3 1 5 A 3 root 2 b 1 5 1 6 A 1 2 3 4 5 6