The Six-Hour Memorized Deck
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The Memorized Deck:

Retention Period of a Memorized Deck

With time, I've discovered that the Joyal Stack is not easy to forget, and I'm sure you'll find it the same for yourself. By reciting the stack each day, the card and stack-number correspondences become increasingly intuitive, popping instantaneously into your mind. In fact, even if you fail to recite the stack daily, even for months, because of its logic, it will remain clear in your memory. It might even be called the "Unforgettable Stack!"

The Six-Hour Memorized Deck, p. 70

At one point or another, every memorized deck if not regularly used will start to fade from your memory.

While not scintifically proven, testimonies on Internet show that some stacks have a higher retention period than others, meaning they stay longer in someone's memory.

The retention period might also be related to the memorization method.

Top of the stack
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