| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] [adj] year ['s] [noun] | 1180 |
|
| 2 | [noun] [prep] [num] year ['s] [noun] | 280 |
|
| 3 | [noun] [prep] 20 [noun] ['s] [noun] | 16 |
|
| 4 | [noun] [prep] 20 year ['s] [noun] | 12 |
|
| 5 | [noun] [prep] 20 year ['s] [noun] | 12 |
|
| 6 | [noun] [prep] 20 year [unc] [noun] | 12 |
|
