| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] years of [noun sg] | 278 |
|
| 2 | thirty years of [noun sg] | 43 |
|
| 3 | [prep] thirty years of | 28 |
|
| 4 | [prep] thirty years [noun sg] | 6 |
|
