| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at [noun prp] [prep] an | 50 |
|
| 2 | at [noun sg] [prep] an | 42 |
|
| 3 | at [noun] in an | 41 |
|
| 4 | at [n mass] [prep] an | 31 |
|
| 5 | at [noun] for an | 23 |
|
| 6 | at [noun] with an | 21 |
|
| 7 | at [noun pl] [prep] an | 15 |
|
| 8 | at [noun] as an | 13 |
|
| 9 | at work [prep] an | 7 |
|
| 10 | at work [prep] an | 7 |
|
| 11 | at [noun] on an | 6 |
|
| 12 | at [noun] to an | 6 |
|
| 13 | at home [prep] an | 6 |
|
| 14 | at home [prep] an | 6 |
|
| 15 | at 37°c [prep] an | 5 |
|
| 16 | at 37°c [prep] an | 5 |
|
