(5, 7)与(6, 7)交换 (3, 7)与(4, 7)交换 (4, 7)与(5, 7)交换 (7, 7)与(7, 8)交换 (6, 7)与(6, 8)交换 (7, 8)与(8, 8)交换 (8, 5)与(8, 6)交换 (7, 4)与(8, 4)交换 (7, 2)与(8, 2)交换 (7, 5)与(8, 5)交换 前面是从上往下数，后面是从左往右数