12 x 3 ) 18 4 3x 3 July 8, 2019 16 32 64 128 12 x 3 )+ 18 4 3x 3 18 + 12 x 3 12 x 12 x 3 12 x 3 3/4 12 x 4 x3 12 x 4 + 3
