| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | years [unc] [noun] | 1296 |
|
| 2 | years [unc] [noun sg] | 1250 |
|
| 3 | [noun] [unc] research | 303 |
|
| 4 | [noun pl] [unc] research | 31 |
|
| 5 | year [unc] research | 13 |
|
| 6 | years [unc] research | 9 |
|
