Smart group of empty groups

Following a significant reorganisation of some of my databases I have large number of empty groups.

I would like to create a smart group that will identify these empty groups.

I thought size =0 might do it but it’s returning groups that contain records, all be it records that are empty by design.

Ideally I need a rule along the lines of “empty=true” or “children=0” or “items=0”.

Can any one suggest a criteria that will help identify these groups?

Searching for kind:group item:!data returns all empty groups & tags.

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Thank you again!

This works perfectly.