| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty years [prep] [noun sg] | 48 |
|
| 2 | twenty years [prep] [noun sg] | 48 |
|
| 3 | twenty years of [noun sg] | 36 |
|
| 4 | twenty years of [noun sg] | 36 |
|
| 5 | twenty years in [noun sg] | 5 |
|
| 6 | twenty years in [noun sg] | 5 |
|
