| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [adv] a period | 26 |
|
| 2 | [vb past] [adv prt] [art] period | 24 |
|
| 3 | [vb past] over [art] period | 21 |
|
| 4 | [vb past] over [art] period | 21 |
|
