| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period of | 842 |
|
| 2 | [conj] a [adj] of | 385 |
|
| 3 | [conj] a period of | 82 |
|
| 4 | [conj] a [adj] period | 77 |
|
| 5 | [conj] [adj] period of | 43 |
|
