| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] [adj] years [unc] | 322 |
|
| 2 | [noun] [prep] 15 [noun] [unc] | 14 |
|
| 3 | [noun] [prep] 15 [noun pl] [unc] | 13 |
|
| 4 | [noun] [prep] 15 year [unc] | 12 |
|
