| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at once [conj] | 357 |
|
| 2 | at [adv] as | 189 |
|
| 3 | at once [subord] | 74 |
|
| 4 | [prep] once as | 17 |
|
| 5 | [prep] once as | 17 |
|
| 6 | at once as | 14 |
|
| 7 | at once as | 14 |
|
