| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] thirty years of [noun] | 17 |
|
| 2 | [prep] thirty years of [noun] | 17 |
|
| 3 | [prep] thirty years of [noun sg] | 16 |
|
| 4 | after thirty years of [noun] | 6 |
|
| 5 | after thirty years of [noun] | 6 |
|
