| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] [pers pn] | 6349 |
|
| 2 | once [prep] a [noun] | 401 |
|
| 3 | once a [noun] [pers pn] | 43 |
|
| 4 | once [prep] [noun] [pers pn] | 19 |
|
