4 6 x 4 18 July 8, 2019 16 32 64 128 4 6 x )* 19 4 18 4 6 x 180 6 x 4 18mm ply 4 ∣ x 4 ∣ 6 18 4 + 4 = 6 4 x 4 x 4 x
