| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [num] [prep] [num] | 26931 |
|
| 2 | [prep] [num] years | 15203 |
|
| 3 | [num] [num] years | 1850 |
|
| 4 | [num] [prep] years | 587 |
|
