| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty years [prep] [adj] [noun] | 20 |
|
| 2 | twenty years [prep] [adj] [noun sg] | 15 |
|
| 3 | twenty years of [adj] [noun] | 14 |
|
| 4 | twenty years of [adj] [noun] | 14 |
|
