| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and [prep] several years | 13 |
|
| 2 | and [prep] several years | 13 |
|
| 3 | and for several years | 7 |
|
| 4 | and for several years | 7 |
|
| 5 | and after several years | 5 |
|
| 6 | and after several years | 5 |
|
