| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [adv] a | 1376 |
|
| 2 | at [adv] a | 1212 |
|
| 3 | at least a | 1183 |
|
| 4 | at [adv] an | 164 |
|
| 5 | at once a | 65 |
|
| 6 | at quite a | 25 |
|
| 7 | at only a | 20 |
|
| 8 | at about a | 15 |
|
| 9 | at both a | 11 |
|
| 10 | at just a | 11 |
|
| 11 | at either a | 5 |
|
| 12 | at around a | 5 |
|
| 13 | at perhaps a | 5 |
|
