| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at an [adj] | 2276 |
|
| 2 | at an [adj] | 2107 |
|
| 3 | [prep] an annual | 491 |
|
| 4 | [prep] an annual | 491 |
|
| 5 | at [art] annual | 337 |
|
| 6 | at [art] annual | 337 |
|
| 7 | at an annual | 96 |
|
| 8 | at an annual | 96 |
|
| 9 | at a annual | 96 |
|
