| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [num] [prep] [num] [unc] | 1041 |
|
| 2 | [num] [prep] [num] years | 923 |
|
| 3 | [prep] [num] years [unc] | 762 |
|
| 4 | [num] [num] years [unc] | 26 |
|
