| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty years [unc] [noun] | 38 |
|
| 2 | [prep] twenty years [unc] | 23 |
|
| 3 | [prep] years [unc] [noun] | 22 |
|
| 4 | [prep] twenty years [noun] | 12 |
|
