| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [adv] a [adj] period [prep] | 12 |
|
| 2 | [prep] [adv] a [adj] period [prep] | 12 |
|
| 3 | [prep] [adv] a [adj] period [prep] | 12 |
|
| 4 | [prep] [adv] a [adj] period [prep] | 12 |
|
| 5 | [prep] only a [adj] period [prep] | 10 |
|
| 6 | [prep] only a [adj] period [prep] | 10 |
|
| 7 | for [adv] a [adj] period [prep] | 9 |
|
| 8 | [prep] [adv] a [adj] period of | 9 |
|
| 9 | for [adv] a [adj] period [prep] | 9 |
|
| 10 | [prep] [adv] a [adj] period of | 9 |
|
