| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [vb pp] a long | 436 |
|
| 2 | [verb] a long period | 34 |
|
| 3 | [verb] [vb pp] a period | 30 |
|
| 4 | [vb pp] a long period | 9 |
|
