| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] a [noun sg] | 70594 |
|
| 2 | once a [noun sg] | 229 |
|
| 3 | [conj] once a | 43 |
|
| 4 | [conj] once [noun sg] | 20 |
|
