| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | several years ' [noun sg] | 23 |
|
| 2 | [prep] years ' [noun sg] | 20 |
|
| 3 | [prep] several years ' | 15 |
|
| 4 | [prep] several years [noun sg] | 5 |
|
