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How to filter posts for Union or intersection

  • Hi there,

    Can someone tell me how I can filter the posts in my blog to get the Union or intersection of Categories?

    I noticed that if I use ?cat=1,3 I get the union of all posts in category 1 or category 3.

    Is there a way I can only show posts that are in both category 1 AND category 3?

    Jeff

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Viewing 3 replies - 1 through 3 (of 3 total)
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