| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] that a period of | 6 |
|
| 2 | that [prep] a period of | 16 |
|
| 3 | that [prep] a period of | 16 |
|
| 4 | that over a period of | 6 |
|
| 5 | that over a period of | 6 |
|
| 6 | that a [adj] period of | 11 |
|
| 7 | that a [adj] period of | 9 |
|
| 8 | that a period of [adj] | 5 |
|
