| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a [adj] period of | 135 |
|
| 2 | [verb] [to-vb] a [adj] of | 30 |
|
| 3 | [to-vb] a [adj] period of | 17 |
|
| 4 | [verb] [to-vb] a period of | 11 |
|
| 5 | [verb] [to-vb] a [adj] period | 11 |
|
| 6 | [verb] [to-vb] [adj] period of | 6 |
|
