| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty years [prep] the [noun] [prep] | 16 |
|
| 2 | twenty years [prep] the [noun] [prep] | 16 |
|
| 3 | twenty years after the [noun] [prep] | 8 |
|
| 4 | twenty years after the [noun] [prep] | 8 |
|
