| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | three year [unc] [noun] | 150 |
|
| 2 | [adj] year [unc] duration | 77 |
|
| 3 | [num] year [unc] duration | 76 |
|
| 4 | three [noun] [unc] duration | 28 |
|
| 5 | three year [unc] duration | 25 |
|
