| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [art] time of | 3085 |
|
| 2 | at [art] time of | 3085 |
|
| 3 | at the time of | 2792 |
|
| 4 | at the time of | 2792 |
|
| 5 | at a time of | 293 |
|
| 6 | at a time of | 293 |
|
