| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] an | 7786 |
|
| 2 | [adv] [prep] an | 4465 |
|
| 3 | once [prep] [art] | 1150 |
|
| 4 | once [prep] [art] | 1150 |
|
| 5 | once [prep] a | 498 |
|
| 6 | once [prep] an | 24 |
|
