| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun sg] [prep] a long period | 28 |
|
| 2 | [prep] [noun] over a long period | 25 |
|
| 3 | of [noun] [prep] a long period | 18 |
|
| 4 | [prep] [noun] for a long period | 5 |
|
| 5 | to [noun] [prep] a long period | 5 |
|
| 6 | with [noun] [prep] a long period | 5 |
|
