| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] at a time [prep] | 25 |
|
| 2 | one at a time [prep] | 20 |
|
| 3 | one at a time [prep] | 20 |
|
| 4 | [indef pn] at a time [prep] | 20 |
|
| 5 | [pron] at a time in | 5 |
|
| 6 | [pron] at a time to | 5 |
|
