| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [adj] [adv] a | 38 |
|
| 2 | at [adj] [adv] a | 36 |
|
| 3 | at [num] [adv] a | 19 |
|
| 4 | at [adj] only a | 11 |
|
| 5 | at [adj -est] [adv] a | 8 |
|
| 6 | at best [adv] a | 8 |
|
| 7 | at good [adv] a | 8 |
|
| 8 | at [det] [adv] a | 6 |
|
| 9 | at first [adv] a | 5 |
|
| 10 | at first [adv] a | 5 |
|
| 11 | at [adj] o'clock a | 5 |
|
| 12 | at [num ord] [adv] a | 5 |
|
