| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] once on a | 6 |
|
| 2 | once [verb] on a | 16 |
|
| 3 | once [vb past] on a | 8 |
|
| 4 | once on a [noun] | 15 |
|
| 5 | once on a [noun sg] | 12 |
|
