| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | in which [verb] [pron] | 168 |
|
| 2 | years in which [pron] | 28 |
|
| 3 | years in which [verb] | 15 |
|
| 4 | years which [verb] [pron] | 6 |
|
