| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] a long period | 72 |
|
| 2 | [noun pl] [verb] [prep] a long | 57 |
|
| 3 | [noun pl] [verb] [prep] a period | 30 |
|
| 4 | [noun pl] [prep] a long period | 29 |
|
