| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [prep] [art] | 11349 |
|
| 2 | once [prep] [art] | 1150 |
|
| 3 | [prep] once [prep] | 348 |
|
| 4 | [prep] once [art] | 261 |
|
