| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period [prep] | 824 |
|
| 2 | [adv] [prep] a [adj] period | 162 |
|
| 3 | [adv] [prep] a period [prep] | 138 |
|
| 4 | [adv] a [adj] period [prep] | 58 |
|
| 5 | [adv] [prep] a [adj] [prep] | 42 |
|
