| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty years [adv] it | 8 |
|
| 2 | twenty years [adv] it | 8 |
|
| 3 | twenty years [conj] it | 7 |
|
| 4 | twenty years ago it | 6 |
|
| 5 | twenty years ago it | 6 |
|
