| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | then [vb pp] [prep] [art] | 1642 |
|
| 2 | by then [vb pp] [prep] | 20 |
|
| 3 | by then [prep] [art] | 8 |
|
| 4 | by [vb pp] [prep] [art] | 5 |
|
