13 3 x 13 4 July 8, 2019 16 32 64 128 13 3 x 4 2 13 3 x 4 5 13 3 x 4 1 5 3 13 x 7 5 13 4 8 13 3 3x 4 )=- 8 13 3 4 x 13 prop 13 3 x 4 8 3 x 13 40 13 3/4 x 19
