| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] at [art] | 9210 |
|
| 2 | then [vb past] [art] | 2440 |
|
| 3 | then at [art] | 229 |
|
| 4 | then [vb past] at | 168 |
|
