| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] at a | 482 |
|
| 2 | [verb] at a time | 345 |
|
| 3 | [adv] at a time | 116 |
|
| 4 | [verb] [adv] a time | 17 |
|
