| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [verb] a long | 280 |
|
| 2 | [adv] a long period | 43 |
|
| 3 | [adv] [verb] a period | 40 |
|
| 4 | [verb] a long period | 34 |
|
