| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [v-ing] at a [adj] [noun sg] | 25 |
|
| 2 | is [v-ing] at a [adj] rate | 18 |
|
| 3 | is [v-ing] at an [adj] [noun sg] | 11 |
|
| 4 | is [v-ing] at a alarming [noun sg] | 5 |
|
