| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [num] year [unc] | 829 |
|
| 2 | [num] year [unc] time | 249 |
|
| 3 | [prep] [num] year time | 123 |
|
| 4 | [prep] year [unc] time | 5 |
|
