| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] an [adv] [adj] period | 5 |
|
| 2 | [noun] [prep] an [adv] [adj] period | 5 |
|
| 3 | [prep] an [adv] [adj] period [prep] | 9 |
|
| 4 | [prep] an [adv] [adj] period [prep] | 9 |
|
