| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] over a period | 311 |
|
| 2 | [noun pl] over a [noun] | 260 |
|
| 3 | [noun pl] [prep] a period | 218 |
|
| 4 | [noun pl] [prep] a period | 218 |
|
| 5 | [noun pl] over [art] period | 165 |
|
| 6 | [noun pl] over [art] period | 165 |
|
| 7 | [noun pl] over a period | 109 |
|
| 8 | [noun pl] over a period | 109 |
|
