| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | up [prep] three years ' | 7 |
|
| 2 | up [prep] three years ' | 7 |
|
| 3 | up [prep] three years ['s] | 7 |
|
| 4 | up [prep] three years [unc] | 7 |
|
| 5 | up to three years [unc] | 6 |
|
| 6 | up to three years [unc] | 6 |
|
