| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that over a [adj] period | 6 |
|
| 2 | that over a [adj] period | 5 |
|
| 3 | that over a period of | 6 |
|
| 4 | that over a period of | 6 |
|
| 5 | that over a period [prep] | 6 |
|
| 6 | that over a period [prep] | 6 |
|
