| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] place over a period | 6 |
|
| 2 | take place over a period | 6 |
|
| 3 | place over a period of | 8 |
|
| 4 | place over a period of | 8 |
|
| 5 | place over a period [prep] | 8 |
|
| 6 | place over a period [prep] | 8 |
|
