| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | of a [adj] period of | 27 |
|
| 2 | of a [adj] period of | 27 |
|
| 3 | of a [adj] period of | 24 |
|
| 4 | of a long period of | 11 |
|
| 5 | of a long period of | 10 |
|
