| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a [adj] period of | 45 |
|
| 2 | [adv] a [adj] period of | 42 |
|
| 3 | [adv prt] a [adj] period of | 21 |
|
| 4 | [adv] a [adj] period of | 20 |
|
| 5 | over a [adj] period of | 18 |
|
| 6 | over a [adj] period of | 18 |
|
| 7 | [adv] a long period of | 12 |
|
| 8 | [adv] a long period of | 12 |
|
| 9 | [adv] a short period of | 11 |
|
| 10 | [adv] a short period of | 11 |
|
| 11 | only a [adj] period of | 10 |
|
| 12 | only a [adj] period of | 10 |
|
