| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [num] years [unc] | 762 |
|
| 2 | [det] [prep] [num] years | 161 |
|
| 3 | [det] [prep] [num] [unc] | 139 |
|
| 4 | [det] [num] years [unc] | 16 |
|
