| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a | 67253 |
|
| 2 | [adv] [prep] a | 36357 |
|
| 3 | once [prep] [art] | 1150 |
|
| 4 | once [prep] a | 498 |
|
