| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that over [art] period | 12 |
|
| 2 | that over a period | 6 |
|
| 3 | that over a period | 6 |
|
| 4 | that over the period | 6 |
|
| 5 | that over the period | 6 |
|
