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Get things with intersect of other things

I have a database of things (bulletins) that each have a set of tags (another thing). I also have list of subscribers that also each have a set of tags. I need to generate text inside a Rich Text Input that displays all of the bulletins with any of the same tags as a subscriber (intersect of the two). They cannot repeat.

I would like to do this with the fewest steps possible, and the result must be generated into a single Rich Text Input (so it can be edited).

also need this - any help?