| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at a time [adv] | 1379 |
|
| 2 | [vb infin] a time [adv] | 47 |
|
| 3 | [vb infin] at a [adv] | 21 |
|
| 4 | [vb infin] at a time | 15 |
|
