| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [am/are] at right angle | 10 |
|
| 2 | [am/are] at right angles | 10 |
|
| 3 | [am/are] at right [noun pl] | 10 |
|
| 4 | are at right [noun] | 9 |
|
