| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | the [noun sg] once [art] | 36 |
|
| 2 | the [noun sg] once [art] | 36 |
|
| 3 | the [noun sg] once a | 26 |
|
| 4 | the [noun sg] once a | 24 |
|
| 5 | the [noun sg] once every | 10 |
|
| 6 | the [noun sg] once every | 10 |
|
