3 4 m 7 8 m July 8, 2019 16 32 64 128 17 m 4 6 7 m 8 3 /( 4m 12 2 M 3 4m )= 7 4 8 m 2 8 m 4 3 m 1 7 3 4 m 7 per 8 meter 3 7 m
