| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] three years [unc] | 102 |
|
| 2 | three years [unc] time | 20 |
|
| 3 | [prep] three years time | 9 |
|
| 4 | [prep] years [unc] time | 5 |
|
