| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [adv] a | 8190 |
|
| 2 | once [conj] [adv] | 554 |
|
| 3 | once [adv] a | 95 |
|
| 4 | once [conj] a | 23 |
|
