| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] a period of | 14 |
|
| 2 | [be] [adv] a period of | 14 |
|
| 3 | [adv] [adv] a period of | 11 |
|
| 4 | [adv] [adv] a period of | 10 |
|
| 5 | [was/were] [adv] a period of | 8 |
|
| 6 | [is] [adv] a period of | 6 |
|
| 7 | is [adv] a period of | 6 |
|
| 8 | was [adv] a period of | 5 |
|
| 9 | [conj] [adv] a period of | 5 |
|
| 10 | [adv] [prep] a period of | 87 |
|
| 11 | [adv] [prep] a period of | 87 |
|
| 12 | [adv] over a period of | 34 |
|
| 13 | [adv] over a period of | 34 |
|
| 14 | [adv] [verb] a period of | 22 |
|
| 15 | [adv] for a period of | 17 |
|
| 16 | [adv] for a period of | 17 |
|
| 17 | [adv] after a period of | 13 |
|
| 18 | [adv] after a period of | 13 |
|
| 19 | [adv] [adv] a period of | 12 |
|
| 20 | [adv] [adv] a period of | 10 |
|
| 21 | [adv] in a period of | 9 |
|
| 22 | [adv] in a period of | 9 |
|
| 23 | [adv] [vb pp] a period of | 8 |
|
| 24 | [adv] be a period of | 5 |
|
| 25 | [adv] long a period of | 5 |
|
| 26 | [adv] long a period of | 5 |
|
| 27 | [adv] [be] a period of | 5 |
|
| 28 | [adv] a [adj] period of | 20 |
|
| 29 | [adv] a [adj] period of | 20 |
|
| 30 | [adv] a short period of | 9 |
|
