| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [noun sg] over a period [prep] | 12 |
|
| 2 | [verb] [noun sg] over a period of | 12 |
|
| 3 | [verb] place over a period [prep] | 5 |
|
| 4 | take [noun sg] over a period [prep] | 5 |
|
