| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty year [coord] [adv] | 61 |
|
| 2 | twenty years [coord] [adv] | 61 |
|
| 3 | twenty year [coord] [adv] | 58 |
|
| 4 | twenty year or [adv] | 43 |
|
| 5 | twenty year [coord] so | 32 |
|
| 6 | twenty year [coord] so | 32 |
|
| 7 | twenty year and [adv] | 18 |
|
| 8 | twenty year [coord] more | 15 |
|
| 9 | twenty year [coord] more | 15 |
|
