| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] [adv] a [noun] | 2889 |
|
| 2 | once [coord] [adv] a | 110 |
|
| 3 | once [adv] a [noun] | 35 |
|
| 4 | once [coord] [adv] [noun] | 15 |
|
