| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be presented at the | 37 |
|
| 2 | be presented at the | 19 |
|
| 3 | were presented at the | 6 |
|
| 4 | is presented at the | 6 |
|
| 5 | was presented at the | 5 |
|
