| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [prep] 20 years ['s] | 5 |
|
| 2 | [adj] to 20 years [unc] | 5 |
|
| 3 | [adj] [prep] 20 years ' | 5 |
|
| 4 | [adj] [prep] 20 years ' | 5 |
|
