| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [indef pn] at [art] time | 23 |
|
| 2 | [prep] [indef pn] at [art] time | 23 |
|
| 3 | [prep] one at [art] time | 17 |
|
| 4 | [prep] [indef pn] at a time | 17 |
|
| 5 | [prep] [indef pn] at the time | 5 |
|
