| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | are sold at a [noun sg] | 8 |
|
| 2 | are [vb pp] at a rate | 6 |
|
| 3 | are [vb pp] at a height | 6 |
|
| 4 | are [vb pp] at a discount | 5 |
|
