First, don't store info like that unless you really, really have to - doing it properly with an extra table or two seems like more work, but it means you don;t have to deal with problems like this (and they get worse, believe me - this is just the start of the problems designs like this cause later, when it's too late to fix them...)
Havign said that, it's possible. Nasty, but possible:
Converting comma separated data in a column to rows for selection[
^]
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