| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] over 30 years | 53 |
|
| 2 | for over 30 years | 43 |
|
| 3 | for over 30 years | 43 |
|
| 4 | of over 30 years | 5 |
|
| 5 | of over 30 years | 5 |
|
