| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period of | 842 |
|
| 2 | to a [adj] of | 61 |
|
| 3 | to a period of | 32 |
|
| 4 | to a [adj] period | 27 |
|
| 5 | to [adj] period of | 5 |
|
