| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] at a time [adv] | 115 |
|
| 2 | [noun pl] at a time [Wh adv] | 112 |
|
| 3 | [noun pl] at a time when | 111 |
|
| 4 | [noun pl] at a time when | 111 |
|
