| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] years and [pron] | 56 |
|
| 2 | [prep] several years and | 46 |
|
| 3 | [prep] several years [pron] | 31 |
|
| 4 | several years and [pron] | 9 |
|
