| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | take place at a time | 18 |
|
| 2 | [verb] place at a time | 18 |
|
| 3 | [verb] place at a time | 18 |
|
| 4 | took place at a time | 11 |
|
| 5 | [vb past] place at a time | 11 |
|
