| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] over [art] period | 163 |
|
| 2 | [noun pl] over a period | 109 |
|
| 3 | [noun pl] over a period | 109 |
|
| 4 | [noun pl] over the period | 54 |
|
| 5 | [noun pl] over the period | 54 |
|
