| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | take place [prep] a period | 10 |
|
| 2 | [verb] place [prep] a period | 10 |
|
| 3 | [verb] place over a period | 6 |
|
| 4 | [verb] place over a period | 6 |
|
