| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [adv] [prep] a | 2631 |
|
| 2 | once [conj] [adv] a | 111 |
|
| 3 | once [adv] [prep] a | 61 |
|
| 4 | once [conj] [adv] [prep] | 58 |
|
