| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adj] period | 519 |
|
| 2 | [prep] a lengthy period | 25 |
|
| 3 | [prep] a lengthy period | 25 |
|
| 4 | over [art] lengthy period | 7 |
|
| 5 | over a lengthy period | 7 |
|
| 6 | over a lengthy [noun] | 7 |
|
| 7 | over a lengthy period | 7 |
|
| 8 | over [art] lengthy period | 7 |
|
