| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] over a long [noun] of | 15 |
|
| 2 | [verb] over a long period of | 15 |
|
| 3 | [verb] over a long period of | 15 |
|
| 4 | [verb] over a long [noun sg] of | 15 |
|
| 5 | [vb pp] over a long [noun] of | 14 |
|
| 6 | [verb] over a long [noun] of | 13 |
|
