| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] a long period | 91 |
|
| 2 | [conj] [verb] [prep] a long | 82 |
|
| 3 | [conj] [verb] [prep] a period | 26 |
|
| 4 | [conj] [prep] a long period | 17 |
|
