These are the best ways I've found on how to learn or memorize Mnemonica Stack order by Juan Tamariz for memorized deck card magic.  Some of the best methods, and alternatives to Rick Lax Mnemonica trainer.
https://ulearnmagic.com/mnemonica-stack-order-juan-tamariz/

Mnemonica Stack Explanation & Tutorial at https://www.youtube.com/watch?v=Kdr16ADlLtI

https://www.pinterest.com/ulearnmagic/

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