| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have led to an | 75 |
|
| 2 | has led [prep] an | 45 |
|
| 3 | have led [prep] an | 13 |
|
| 4 | had led [prep] an | 9 |
|
| 5 | have led [prep] an | 6 |
|
