| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] at [det] | 1237 |
|
| 2 | then [vb past] [det] | 253 |
|
| 3 | then [vb past] at | 168 |
|
| 4 | then at [det] | 30 |
|
