| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have occurred [prep] | 35 |
|
| 2 | which have occurred [prep] | 35 |
|
| 3 | [Wh det] have occurred [prep] | 35 |
|
| 4 | [pron] have occurred in | 21 |
|
