| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] an [noun sg] [pron] happened | 5 |
|
| 2 | [prep] an [noun sg] [pron] happened | 5 |
|
| 3 | an [noun sg] [prep] [pron] happened | 8 |
|
| 4 | an [noun sg] [prep] [pron] happened | 8 |
|
