| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [verb] at | 3848 |
|
| 2 | [vb past] [verb] an | 2881 |
|
| 3 | [verb] at an | 1157 |
|
| 4 | [vb past] at an | 154 |
|
