| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | than three years [unc] | 10 |
|
| 2 | [subord] three years ' | 10 |
|
| 3 | [subord] three years ' | 10 |
|
| 4 | [subord] three years ['s] | 10 |
|
