| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [num] years [unc] | 762 |
|
| 2 | is [prep] [num] years | 65 |
|
| 3 | is [prep] [num] [unc] | 20 |
|
| 4 | is [num] years [unc] | 7 |
|
