| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | two years [unc] | 213 |
|
| 2 | two years ' | 207 |
|
| 3 | two years ' | 207 |
|
| 4 | two years ['s] | 207 |
|
| 5 | two years [no cls] | 6 |
|
