| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] period [conj] | 194 |
|
| 2 | [prep] [art] longer period | 89 |
|
| 3 | [art] longer period [conj] | 19 |
|
| 4 | [prep] [art] longer [conj] | 10 |
|
