| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty years [subord] [noun] [noun] | 7 |
|
| 2 | twenty years [subord] [noun prp] [noun] | 6 |
|
| 3 | twenty years [subord] [noun] [noun] | 7 |
|
| 4 | twenty years [subord] [noun] [noun prp] | 6 |
|
