| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] the same period [prep] | 131 |
|
| 2 | [vb pp] [prep] the period [prep] | 112 |
|
| 3 | [vb pp] [prep] the same period | 74 |
|
| 4 | [vb pp] [prep] the same [prep] | 5 |
|
