| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] [num] of years [prep] | 11 |
|
| 2 | [vb pp] [prep] [num] of years [prep] | 8 |
|
| 3 | [verb] [prep] [num] of years of | 6 |
|
| 4 | [verb] [prep] thousands of years [prep] | 5 |
|
