| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty year [noun sg] | 29 |
|
| 2 | twenty years [noun] | 25 |
|
| 3 | twenty year [noun] | 14 |
|
| 4 | twenty year period | 8 |
|
| 5 | twenty year period | 8 |
|
| 6 | twenty year [noun prp] | 7 |
|
| 7 | twenty year time | 5 |
|
| 8 | twenty year time | 5 |
|
