| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] at a | 8330 |
|
| 2 | occur [prep] a | 735 |
|
| 3 | occur [prep] a | 735 |
|
| 4 | occur at [art] | 309 |
|
| 5 | occur at a | 117 |
|
