| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [num] years [unc] | 762 |
|
| 2 | [is] [prep] [num] years | 72 |
|
| 3 | [is] [prep] [num] [unc] | 25 |
|
| 4 | [is] [num] years [unc] | 8 |
|
