| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] lead to an improvement | 6 |
|
| 2 | [vb mod] lead to [art] improvement | 6 |
|
| 3 | [vb mod] lead to [art] improvement | 6 |
|
| 4 | [vb mod] lead to a improvement | 6 |
|
