| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [art] [det] time | 6927 |
|
| 2 | at [art] [det] time | 6927 |
|
| 3 | at an [adj] time | 53 |
|
| 4 | at an [det] [noun] | 16 |
|
| 5 | at an [det] [noun sg] | 14 |
|
| 6 | [prep] an [det] time | 12 |
|
| 7 | at an [det] time | 11 |
|
| 8 | at a [det] time | 11 |
|
