| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] once in a [noun] | 18 |
|
| 2 | [conj] once in a [noun sg] | 17 |
|
| 3 | [conj] once in a while | 11 |
|
| 4 | [conj] once in a while | 11 |
|
| 5 | [coord] once in a [noun] | 8 |
|
| 6 | and once in a [noun] | 6 |
|
| 7 | and once in a [noun] | 6 |
|
| 8 | [that] once in a [noun] | 5 |
|
| 9 | that once in a [noun] | 5 |
|
| 10 | [subord] once in a [noun] | 5 |
|
| 11 | that once in a [noun] | 5 |
|
