| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun sg] over a period | 28 |
|
| 2 | in [noun sg] over a period | 10 |
|
| 3 | in [noun sg] over a period | 10 |
|
| 4 | of [noun sg] over a period | 9 |
|
| 5 | of [noun sg] over a period | 9 |
|
