| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a longer period of | 8 |
|
| 2 | [noun sg] [prep] a longer period of | 7 |
|
| 3 | [prep] a longer period of [noun] | 11 |
|
| 4 | [prep] a longer period of [noun sg] | 11 |
|
| 5 | [prep] a longer period of time | 10 |
|
| 6 | [prep] a longer period of time | 10 |
|
