| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which has occur [prep] [art] | 8 |
|
| 2 | which has occur [prep] [art] | 8 |
|
| 3 | which has occur [prep] the | 8 |
|
| 4 | which has occurred [prep] [art] | 8 |
|
| 5 | which has occur [prep] the | 8 |
|
| 6 | which has occur in [art] | 5 |
|
