| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a [adj] period of | 135 |
|
| 2 | [verb] [vb pp] a [adj] of | 37 |
|
| 3 | [verb] [vb pp] a period of | 21 |
|
| 4 | [vb pp] a [adj] period of | 15 |
|
| 5 | [verb] [vb pp] a [adj] period | 13 |
|
| 6 | [verb] [vb pp] [adj] period of | 5 |
|
