| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | only a [adj] period [prep] | 14 |
|
| 2 | only a [adj] period [prep] | 14 |
|
| 3 | only a [adj] period [prep] | 14 |
|
| 4 | only a [adj] period of | 10 |
|
| 5 | only a [adj] period of | 10 |
|
| 6 | only a short period [prep] | 7 |
|
| 7 | only a short period [prep] | 7 |
|
