Minus list not working as expected

Trying to show duplicates only, so I have a list of users with a set of interests (in this particular example a total 64 including duplicates), and I want to remove all the unique interests (in this case 42), and show only the remaining 22 duplicate interests. Showing the common interests amongst the list of users.

However, the operation didn’t work as intended, and the “unique list” returns nothing.

But when calling the unique list first, it does show the 42 unique interests.

Once you do most Bubble list operators, there are no duplicate items.

Is there a way to show the opposite of “intersect with”?

What would be the best way to show common interests in this case?

Probably the way to do this was to have interests with a list of users with that interest.

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