3 x 3 90 July 8, 2019 16 32 64 128 3 x 3 x 2 90 X 3 2x 3 90 3 4 x 3 4 90 3 4 x 3 4 90 degree elbow 3 8 x 3 8 90 degree elbow 3 8 x 3 8 90 3 4 x 3 8 90 3 x 3 = 9 3 x 3 x 3 x 3 x 3 x 0 3 x 90 90 x 3 =
