Arkham Horror: How not to mix expansion cards

AH_MythosCardsArkham Horror expansions,
makes the game challenging, unique, and adds its share of variety.  The price we pay to expand the game is mixing hundreds of cards.  Worse, we feel compelled to sort them after the game is over before returning to storage.   What if there was a way to avoid all the post-game trouble while preserving random chance?  Here is a way how not to mix expansion cards.

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