| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once [coord] [adv] | 541 |
|
| 2 | [conj] once [adv] | 525 |
|
| 3 | [conj] [coord] [adv] | 417 |
|
| 4 | [conj] once [coord] | 47 |
|
