| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] years [unc] study | 6 |
|
| 2 | [num] years [unc] study | 6 |
|
| 3 | years [unc] [adj] study | 5 |
|
| 4 | years [unc] [adj] study | 5 |
|
