| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [verb] a [noun sg] | 9468 |
|
| 2 | once [verb] a [noun sg] | 263 |
|
| 3 | [vb base] once a [noun sg] | 36 |
|
| 4 | [vb base] once [verb] a | 9 |
|
