| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a period [prep] | 1753 |
|
| 2 | [conj] a period [prep] | 89 |
|
| 3 | [conj] [prep] a period | 76 |
|
| 4 | [conj] [prep] a [prep] | 7 |
|
