| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over a longer period [prep] time | 6 |
|
| 2 | over a longer [noun] [prep] time | 6 |
|
| 3 | over a longer [noun] of time | 6 |
|
| 4 | over a longer [noun sg] [prep] time | 6 |
|
| 5 | over a longer period [prep] time | 6 |
|
