4 x 4 18 July 8, 2019 16 32 64 128 4 x 4 + 6 18 2x 4 x 4 18 X 4 18 4 5 4 x 2 18 4 4 x 4 1 x 18 4 x 4 )+ 18 3 x 3 4 2 x 180 4 4 18 25 x 4 18 25 4 x 4 x 4 x 4 x 18 4 × 18