| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] over a [adj] period | 71 |
|
| 2 | [vb pp] over a long period | 44 |
|
| 3 | [vb pp] over a long period | 34 |
|
| 4 | [vb pp] over a [adj -er] period | 12 |
|
| 5 | [vb pp] over a longer period | 10 |
|
| 6 | [vb pp] over a three-year period | 5 |
|
| 7 | [vb pp] over a three-year period | 5 |
|
| 8 | developed over a [adj] period | 5 |
|
