Custom RSS feed – show posts only if they exist in multiple categories

  • New to WP and not sure what the best way to go about creating an RSS feed that will show me posts that exist in both category A + B while excluding posts that only exist in either A or B.

    For example:

    Categories
    Issue
    -Issue A
    -Issue B

    Media
    -Release
    -Statement

    I want to create a feed such that I can specify ‘cat=issue A’ and ‘cat=release’. But I don’t want all posts in both categories as some statements might have been marked Issue A as well.

    I know I can use the ‘-‘ modifier to exclude categories, but this is not ideal if new categories are being added from time to time – the RSS feeds would have to be constantly updated.

    Are there any other alternatives ? My thought is that feed.php would require some hacking. but I feel like I’m overlooking something simple so wanted to check here first.

    Any suggestions greatly appreciated.

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