| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at a [noun] conference in | 59 |
|
| 2 | at a [noun sg] conference in | 58 |
|
| 3 | at a press conference in | 39 |
|
| 4 | at a press conference in | 39 |
|
| 5 | at a news conference in | 9 |
|
| 6 | at a news conference in | 9 |
|
