| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adv] a [adj] period of | 9 |
|
| 2 | [prep] [adv] a [adj] period of | 9 |
|
| 3 | for [adv] a [adj] period of | 6 |
|
| 4 | for [adv] a [adj] period of | 6 |
|
| 5 | [adv] [prep] a [adj] period of | 46 |
|
| 6 | [adv] [prep] a [adj] period of | 46 |
|
| 7 | [adv] for a [adj] period of | 20 |
|
| 8 | [adv] for a [adj] period of | 20 |
|
| 9 | [adv] [verb] a [adj] period of | 19 |
|
| 10 | [adv] over a [adj] period of | 10 |
|
| 11 | [adv] over a [adj] period of | 10 |
|
| 12 | [adv] after a [adj] period of | 7 |
|
| 13 | [adv] after a [adj] period of | 7 |
|
| 14 | [adv] [vb past] a [adj] period of | 6 |
|
| 15 | [adv] a [adj] period of [noun] | 16 |
|
| 16 | [adv] a [adj] period of [noun sg] | 15 |
|
| 17 | [adv] a [adj] period of time | 11 |
|
| 18 | [adv] a [adj] period of time | 11 |
|
