| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a [noun sg] | 74195 |
|
| 2 | [adv] a [noun sg] | 46305 |
|
| 3 | once [art] [noun sg] | 2097 |
|
| 4 | once a [noun] | 1633 |
|
| 5 | once a [noun sg] | 1606 |
|
