| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] over a [adj] period | 71 |
|
| 2 | [verb] over a long period | 35 |
|
| 3 | developed over a [adj] period | 5 |
|
| 4 | develop over a [adj] period | 5 |
|
| 5 | [verb] over a three-year period | 5 |
|
