| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | of [adj] years [unc] | 211 |
|
| 2 | of [num] years [unc] | 190 |
|
| 3 | [prep] 20 years [unc] | 34 |
|
| 4 | of 20 [noun] [unc] | 14 |
|
| 5 | of 20 [noun pl] [unc] | 8 |
|
| 6 | of 20 year [unc] | 6 |
|
| 7 | of 20 years [unc] | 6 |
|
