| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] over a [num] [noun sg] period | 22 |
|
| 2 | [vb pp] over a [adj] year period | 8 |
|
| 3 | [vb pp] over a [adj] month period | 6 |
|
| 4 | collected over a [adj] [noun sg] period | 5 |
|
