| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [prep] a [adj] period of | 17 |
|
| 2 | [conj] [prep] a [adj] period of | 17 |
|
| 3 | [coord] [prep] a [adj] period of | 11 |
|
| 4 | [conj] for a [adj] period of | 6 |
|
| 5 | or [prep] a [adj] period of | 5 |
|
| 6 | and [prep] a [adj] period of | 5 |
|
| 7 | and [prep] a [adj] period of | 5 |
|
| 8 | [conj] after a [adj] period of | 5 |
|
| 9 | or [prep] a [adj] period of | 5 |
|
