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