| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [adv] [noun] | 2200 |
|
| 2 | at [adv] [noun] | 2105 |
|
| 3 | [prep] once [noun] | 112 |
|
| 4 | [prep] once [noun] | 112 |
|
| 5 | at once [noun] | 69 |
|
| 6 | at once [noun] | 69 |
|
