| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | twenty years ['s] [noun] | 38 |
|
| 2 | [prep] twenty years ['s] | 21 |
|
| 3 | [prep] years ['s] [noun] | 21 |
|
| 4 | [prep] twenty years [noun] | 12 |
|
