| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [noun sg] over [art] period | 10 |
|
| 2 | [det] [noun sg] over a period | 8 |
|
| 3 | [det] [noun sg] over a period | 8 |
|
| 4 | this [noun sg] over [art] period | 5 |
|
