| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [noun sg] once [art] | 29 |
|
| 2 | a [noun sg] once a | 22 |
|
| 3 | a [noun sg] once a | 22 |
|
| 4 | a [noun sg] once every | 6 |
|
| 5 | a [noun sg] once every | 6 |
|
