| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] a [adj] [noun sg] | 36332 |
|
| 2 | once a [adj] [noun sg] | 208 |
|
| 3 | once [vb past] a [noun sg] | 152 |
|
| 4 | once [vb past] a [adj] | 53 |
|
| 5 | once [vb past] [adj] [noun sg] | 10 |
|
