| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] over a period of [adj] | 32 |
|
| 2 | [vb pp] over a period of [adj] | 30 |
|
| 3 | [verb] over a period of [num] | 26 |
|
| 4 | [verb] over a period of two | 5 |
|
| 5 | [verb] over a period of [det] | 5 |
|
| 6 | [verb] over a period of two | 5 |
|
