| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be at right angle | 23 |
|
| 2 | be at right angles | 23 |
|
| 3 | be at right [noun pl] | 23 |
|
| 4 | are at right [noun] | 9 |
|
| 5 | is at right [noun] | 7 |
|
