| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] them at a time | 8 |
|
| 2 | [prep] them at a time | 8 |
|
| 3 | them one at a time | 13 |
|
| 4 | them [indef pn] at a time | 13 |
|
| 5 | them [pron] at a time | 13 |
|
| 6 | them one at a time | 13 |
|
| 7 | them at a time [Wh adv] | 5 |
|
| 8 | them at a time when | 5 |
|
| 9 | them at a time [adv] | 5 |
|
| 10 | them at a time when | 5 |
|
