| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] two years [unc] | 29 |
|
| 2 | [adv] two years ' | 26 |
|
| 3 | [adv] two years ' | 26 |
|
| 4 | [adv] two years ['s] | 26 |
|
| 5 | least two years [unc] | 12 |
|
| 6 | least two years [unc] | 12 |
|
