| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] first years | 69 |
|
| 2 | [prep] [art] first 20 | 34 |
|
| 3 | [prep] [art] 20 years | 20 |
|
| 4 | [art] first 20 years | 6 |
|
