| 3 6 8 12 18 24 30 36 | | | 8 | ① | ② | | ③ | | | ④ 6 - 8 18 30 | | ⑤ 6 12 24 36 | ⑥ | | ⑦ 6 12 18 24 | 30 36 | | | | |