| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] twenty years ' [noun sg] | 19 |
|
| 2 | in twenty years ' [noun] | 9 |
|
| 3 | [prep] twenty years ' time | 8 |
|
| 4 | [prep] twenty years ' time | 8 |
|
| 5 | of twenty years ' [noun] | 5 |
|
