| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | or four years ' [noun sg] | 10 |
|
| 2 | or four years ' [noun sg] | 10 |
|
| 3 | or four years ['s] [noun sg] | 10 |
|
| 4 | or four years [unc] duration | 7 |
|
