| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] over a period of [noun] | 18 |
|
| 2 | [adv] over a period of [adj] | 10 |
|
| 3 | [adv] over a period of time | 9 |
|
| 4 | [adv] over a period of time | 9 |
|
| 5 | [adv] over a period of [noun pl] | 9 |
|
| 6 | [adv] over a period of [noun sg] | 9 |
|
| 7 | [adv] over a period of [num] | 7 |
|
| 8 | [verb] [adv] over a period of | 11 |
|
| 9 | [noun] [adv] over a period of | 7 |
|
| 10 | [adv] [adv] over a period of | 5 |
|
| 11 | [adv] [verb] over a period of | 8 |
|
| 12 | [adv] [vb pp] over a period of | 8 |
|
| 13 | [adv] over a [adj] period of | 10 |
|
| 14 | [adv] over a [adj] period of | 10 |
|
| 15 | [adv] over a long period of | 7 |
|
| 16 | [adv] over a long period of | 7 |
|
