| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun] over a period | 56 |
|
| 2 | [prep] [noun sg] over a period | 28 |
|
| 3 | of [noun] over a period | 20 |
|
| 4 | of [noun] over a period | 20 |
|
| 5 | [prep] [noun pl] over a period | 19 |
|
| 6 | in [noun] over a period | 12 |
|
| 7 | in [noun] over a period | 12 |
|
| 8 | [prep] [noun prp] over a period | 6 |
|
| 9 | to [noun] over a period | 6 |
|
| 10 | to [noun] over a period | 6 |
|
