| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [prep] the period [prep] | 15 |
|
| 2 | [vb base] [prep] the period of | 8 |
|
| 3 | [vb base] [prep] the period of | 8 |
|
| 4 | [vb base] from the period [prep] | 6 |
|
