| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] at a | 2179 |
|
| 2 | [adv] at a | 1370 |
|
| 3 | once [prep] a | 498 |
|
| 4 | once [prep] a | 498 |
|
| 5 | once at [art] | 53 |
|
| 6 | once at a | 7 |
|
| 7 | once at a | 7 |
|
