| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty years [prep] [noun sg] | 48 |
|
| 2 | twenty years of [noun] | 42 |
|
| 3 | twenty years [prep] [noun prp] | 23 |
|
| 4 | twenty years in [noun] | 13 |
|
| 5 | twenty years [prep] [noun pl] | 10 |
|
| 6 | twenty years after [noun] | 9 |
|
