| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] 30 years | 156 |
|
| 2 | [noun] [prep] over 30 | 57 |
|
| 3 | [prep] over 30 years | 53 |
|
| 4 | [noun] over 30 years | 8 |
|
