| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adv] [adj] period of | 57 |
|
| 2 | [prep] a [adv] [adj] period of | 57 |
|
| 3 | [prep] a [adv] [adj] period of | 50 |
|
| 4 | [prep] a [adv] short period of | 34 |
|
| 5 | [prep] a [adv] short period of | 31 |
|
| 6 | [prep] a very [adj] period of | 20 |
|
| 7 | [prep] a very [adj] period of | 20 |
|
| 8 | [prep] a relatively [adj] period of | 18 |
|
| 9 | [prep] a relatively [adj] period of | 18 |
|
| 10 | for a [adv] [adj] period of | 17 |
|
| 11 | in a [adv] [adj] period of | 13 |
|
| 12 | [prep] a [adv] long period of | 11 |
|
| 13 | over a [adv] [adj] period of | 8 |
|
| 14 | [prep] a [adv] [adj -er] period of | 7 |
|
| 15 | [prep] a [adv] long period of | 7 |
|
| 16 | within a [adv] [adj] period of | 7 |
|
| 17 | [prep] a much [adj] period of | 6 |
|
| 18 | [prep] a much [adj] period of | 6 |
|
