| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] [v-ing] at [art] rate of | 8 |
|
| 2 | [been] [v-ing] at [art] rate [prep] | 8 |
|
| 3 | been [v-ing] at [art] rate [prep] | 8 |
|
