| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty year [unc] | 45 |
|
| 2 | twenty years [unc] | 43 |
|
| 3 | twenty year ['s] | 43 |
|
| 4 | twenty year ' | 41 |
|
| 5 | twenty year ' | 41 |
|
