| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty years of [noun] and | 6 |
|
| 2 | twenty years of [noun] [coord] | 6 |
|
| 3 | twenty years of [noun] and | 6 |
|
| 4 | twenty years of [noun] [conj] | 6 |
|
| 5 | twenty years of [noun sg] [conj] | 6 |
|
