| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a [adj] period [prep] | 53 |
|
| 2 | [adv] a [adj] period of | 42 |
|
| 3 | [adv] a [adj] period [prep] | 27 |
|
| 4 | [adv prt] a [adj] period [prep] | 23 |
|
| 5 | over a [adj] period [prep] | 19 |
|
| 6 | over a [adj] period [prep] | 19 |
|
| 7 | only a [adj] period [prep] | 14 |
|
| 8 | only a [adj] period [prep] | 14 |
|
| 9 | [adv] a long period [prep] | 13 |
|
| 10 | [adv] a long period [prep] | 13 |
|
| 11 | [adv] a short period [prep] | 12 |
|
| 12 | [adv] a short period [prep] | 12 |
|
