| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at an [adj] | 2276 |
|
| 2 | at an [adj] | 2107 |
|
| 3 | [prep] an additional | 396 |
|
| 4 | at [art] additional | 66 |
|
| 5 | at [art] additional | 66 |
|
| 6 | at an additional | 56 |
|
| 7 | at a additional | 56 |
|
