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3) In other cases, you would like to perform operations on a certain subset of consumer groups, thus, it would be great to have something as a repeatable `--group` option for each group.   

4) By performing Performing a Describe query on all consumer groups with a combination of options `--describe` and `--state` will allow us to grep consumer groups by their state (like `Stable, Dead, Empty, PreparingRebalance, NonExisting`). The only thing we have to do is to extend the "results table" with a GROUP column. 

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