| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] period [prep] | 3127 |
|
| 2 | [vb past] [prep] [art] period | 115 |
|
| 3 | [vb past] [art] period [prep] | 99 |
|
| 4 | [vb past] [prep] [art] [prep] | 53 |
|
