| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [vb pp] [prep] a long period | 15 |
|
| 2 | have [vb pp] [prep] a long period | 15 |
|
| 3 | have [vb pp] over a long period | 12 |
|
| 4 | have [vb pp] over a long period | 12 |
|
| 5 | have [vb pp] a long period [prep] | 5 |
|
| 6 | have [vb pp] a long period [prep] | 5 |
|
