| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at once [prep] [art] | 139 |
|
| 2 | at once [prep] [art] | 139 |
|
| 3 | at once [prep] a | 50 |
|
| 4 | at [adv] [prep] an | 25 |
|
| 5 | at [adv] [prep] an | 25 |
|
| 6 | at once [prep] an | 8 |
|
| 7 | at once [prep] an | 8 |
|
| 8 | [prep] once [prep] an | 8 |
|
| 9 | [prep] once [prep] an | 8 |
|
| 10 | at once [prep] an | 8 |
|
