| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [adj] period [prep] | 250 |
|
| 2 | an [adj] period [prep] | 151 |
|
| 3 | an [adv] [adj] period | 28 |
|
| 4 | an [adv] [adj] [prep] | 8 |
|
