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Have a look at the following Design Blog post, I think it may put you on the right track:
https://community.qlik.com/t5/Qlik-Design-Blog/Set-Analysis-in-the-Aggr-function/ba-p/1463822
If you want to search the other posts in this area, use this link:
https://community.qlik.com/t5/Qlik-Design-Blog/bg-p/qlik-design-blog
Regards,
Brett