R 3 3 6 July 8, 2019 16 32 64 128 R 3 3 6 proof Prove r 3 3 )= 6 R 3 3 6 6 9 9 6 r 3 3 m 2 3 r 1 − 3 6 R 3 6 R(3 3 3) R - 3 R 3 3