| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] a long period | 53 |
|
| 2 | [verb] over a long period | 35 |
|
| 3 | [verb] for a long period | 22 |
|
| 4 | develop [prep] a long period | 5 |
|
| 5 | [to-vb] [prep] a long period | 5 |
|
| 6 | [verb] after a long period | 5 |
|
| 7 | developed [prep] a long period | 5 |
|
