| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at a [noun] | 16739 |
|
| 2 | at [art] time | 11461 |
|
| 3 | [prep] a time | 4735 |
|
| 4 | [prep] a time | 4735 |
|
| 5 | at a time | 3145 |
|
