| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once [conj] [adv] a [noun sg] | 110 |
|
| 2 | [conj] [conj] [adv] a [noun sg] | 31 |
|
| 3 | [conj] once [conj] [adv] a | 7 |
|
| 4 | [conj] once [adv] a [noun sg] | 6 |
|
