| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [prep] a longer period | 27 |
|
| 2 | [noun] over a longer period | 25 |
|
| 3 | [noun pl] [prep] a longer period | 13 |
|
| 4 | [noun] for a longer period | 11 |
|
