| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [prep] a [adj] | 44 |
|
| 2 | occurred [prep] a [adj] | 32 |
|
| 3 | has occurred [prep] a | 29 |
|
| 4 | has occurred [prep] [adj] | 17 |
|
