| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have led | 238 |
|
| 2 | [Wh det] had led | 103 |
|
| 3 | [Wh det] has led | 97 |
|
| 4 | [Wh det] have led | 42 |
|
| 5 | what have led | 5 |
|
