| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | every once [prep] a while | 9 |
|
| 2 | every once [prep] a [noun sg] | 9 |
|
| 3 | every once [prep] a while | 9 |
|
| 4 | every once [prep] a [noun] | 9 |
|
