| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] [adj] | 7988 |
|
| 2 | once [prep] a [noun] | 401 |
|
| 3 | once [prep] a [adj] | 66 |
|
| 4 | once a [noun] [adj] | 20 |
|
| 5 | once [prep] [noun] [adj] | 13 |
|
