| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have led to a | 311 |
|
| 2 | has led [prep] a | 189 |
|
| 3 | had led [prep] a | 50 |
|
| 4 | have led [prep] a | 49 |
|
| 5 | have led [prep] a | 23 |
|
