1g 3g 9g 1 = + 1 2 = + 3 - 1 3 = + 3 4 = + 3 + 1 5 = + 9 - 3 - 1 6 = + 9 - 3 7 = + 9 - 3 + 1 8 = + 9 - 1 9 = + 9 10 = + 9 + 1 11 = + 9 + 3 - 1 12 = + 9 + 3 13 = + 9 + 3 + 1 (-表示放物品同侧, +表示放不同侧)