| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] period of | 2328 |
|
| 2 | [art] longest period of | 10 |
|
| 3 | [prep] [art] longest period | 7 |
|
| 4 | [prep] [art] longest of | 6 |
|
