| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] over [art] period | 21 |
|
| 2 | [be] [vb pp] over [art] period | 21 |
|
| 3 | [be] [vb pp] over a period | 16 |
|
| 4 | [be] [vb pp] over a period | 16 |
|
| 5 | [be] [vb pp] over the period | 5 |
|
| 6 | [be] [vb pp] over the period | 5 |
|
