| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a period [prep] | 1753 |
|
| 2 | [adv] [prep] a period | 121 |
|
| 3 | [adv] a period [prep] | 41 |
|
| 4 | [adv] [prep] a [prep] | 32 |
|
