| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] twenty years ' | 21 |
|
| 2 | in twenty years ' | 9 |
|
| 3 | in twenty years ' | 9 |
|
| 4 | of twenty years ' | 7 |
|
| 5 | of twenty years ' | 7 |
|
