| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] a long period | 53 |
|
| 2 | [adv] [vb pp] [prep] a long | 33 |
|
| 3 | [adv] [vb pp] [prep] a period | 32 |
|
| 4 | [adv] [prep] a long period | 21 |
|
