| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] twenty year [unc] time | 8 |
|
| 2 | in twenty year [unc] time | 8 |
|
| 3 | [prep] twenty year [unc] time | 8 |
|
| 4 | in twenty year [unc] time | 8 |
|
