4 4m 12 July 8, 2019 16 32 64 128 6m 4 4m 12 3 4 4m 12 )= 12 4m 4 ≤ 12 4m 4 8 12 5m 4m 4 12 4m 4 8 =- 2m 12 4 m 12
