| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | three years [unc] [noun] | 146 |
|
| 2 | [adj] years [unc] duration | 71 |
|
| 3 | three [noun pl] [unc] duration | 28 |
|
| 4 | three [noun] [unc] duration | 28 |
|
| 5 | three year [unc] duration | 25 |
|
