A b c d 1 2 July 8, 2019 16 32 64 128 A b c d 1 2 3 A b c d 1 2 3 4 A b c d 1 2 3 4 5 6 A b c d 1 2 abcd 1 2 A b c d 1 2 3 4 5 A b c d 1 2 3 abcd 123 A 4 b 3 c 2 d 1 f 0 Class 1 div 2 groups a b c d A 1 b 2 c 3 d 4 e 5 A b c d e f 1 2 A 1 b 0 c 1 d 2 A b c d 1 2 3 4 then find a b A 3 b 2 c 1 d 0
