| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] several years it | 6 |
|
| 2 | for several years it | 6 |
|
| 3 | [prep] several years it | 6 |
|
| 4 | [prep] several years it | 6 |
|
| 5 | for several years it | 6 |
|
