| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [vb pp] a [adj] period [prep] | 9 |
|
| 2 | have [vb pp] a [adj] period [prep] | 9 |
|
| 3 | had [vb pp] a [adj] period [prep] | 5 |
|
| 4 | have [vb pp] a long period [prep] | 5 |
|
| 5 | have [vb pp] a [adj] period of | 5 |
|
| 6 | have [vb pp] a long period [prep] | 5 |
|
