| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | occurred at a time [Wh adv] | 6 |
|
| 2 | occurred at [art] time [Wh adv] | 6 |
|
| 3 | occurred at a time [Wh adv] | 6 |
|
| 4 | occurred at [art] time when | 6 |
|
| 5 | occurred at [art] time [Wh adv] | 6 |
|
