| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a longer period [prep] | 17 |
|
| 2 | [prep] a longer period [prep] | 17 |
|
| 3 | over a longer period [prep] | 8 |
|
| 4 | over a longer period [prep] | 8 |
|
| 5 | [verb] a longer period [prep] | 7 |
|
| 6 | for a longer period [prep] | 6 |
|
| 7 | for a longer period [prep] | 6 |
|
| 8 | a [adv] longer period [prep] | 5 |
|
| 9 | a [adv] longer period [prep] | 5 |
|
| 10 | a longer period [prep] [noun] | 19 |
|
| 11 | a longer period [prep] [noun sg] | 18 |
|
| 12 | a longer period [prep] time | 13 |
|
| 13 | a longer period [prep] time | 13 |
|
| 14 | a longer period [prep] [adj] | 5 |
|
