| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [verb] [art] [adj] period of | 9 |
|
| 2 | have [verb] [art] [adj] period of | 9 |
|
| 3 | have [verb] a [adj] period of | 7 |
|
| 4 | have [verb] a [adj] period of | 6 |
|
