| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] several years [prep] | 136 |
|
| 2 | [prep] several [prep] [pron] | 81 |
|
| 3 | [prep] years [prep] [pron] | 62 |
|
| 4 | [prep] several years [pron] | 31 |
|
| 5 | several years [prep] [pron] | 12 |
|
