| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a [adv] [adj] period [prep] | 8 |
|
| 2 | over a [adv] [adj] period of | 8 |
|
| 3 | over a [adv] [adj] period [prep] | 8 |
|
| 4 | over a [adv] [adj] period of | 8 |
|
| 5 | [noun] over a [adv] [adj] period | 15 |
|
| 6 | [noun sg] over a [adv] [adj] period | 10 |
|
| 7 | [verb] over a [adv] [adj] period | 7 |
|
| 8 | [vb pp] over a [adv] [adj] period | 7 |
|
