| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at which [noun] | 816 |
|
| 2 | at which [noun pl] | 245 |
|
| 3 | [prep] which words | 32 |
|
| 4 | at [pron] words | 26 |
|
| 5 | at [Wh det] words | 5 |
|
| 6 | at which word | 5 |
|
| 7 | at which words | 5 |
|
