| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [pron] [adv] [vb past] | 971 |
|
| 2 | at which [pron] [vb past] | 182 |
|
| 3 | at [pron] [adv] [vb past] | 27 |
|
| 4 | at which [pron] [adv] | 14 |
|
