| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for several years | 527 |
|
| 2 | of several years | 52 |
|
| 3 | after several years | 51 |
|
| 4 | over several years | 45 |
|
| 5 | by several years | 12 |
|
| 6 | in several years | 12 |
|
| 7 | to several years | 8 |
|
| 8 | with several years | 7 |
|
| 9 | until several years | 7 |
|
