If you read this book, do you agree that his analysis is wrong when he said to multiply 52x52 to get how many 2-digit cards to memorize (p 167)? I think it should be 52x51.
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Ben mentioned having 2,704 images.
There might be more about it in these discussions:
I also have images for two of the same card (for example, ace of hearts + ace of hearts is a hat). It’s not necessary if you’re memorising single packs, but it might be needed if you try to memorise multiple packs shuffled together.
And really, if you’ve decided to create 2652 images, it’s really no extra trouble to create another 52! 
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If your only considering speed cards and hour cards, you’re right; however…
…and your talking about an extra 2% of effort, so why wouldn’t you just go for it. It also makes practice easier, because you can just shuffle two decks together and don’t have to worry about the (otherwise) exceptions.
Not wrong, just a bigger picture approach from… this is what I need for competitions.
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It’s also worth mentioning that my system uses the same bank of 2704 images for numbers, binary digits and historic dates. Many of the “two identical cards” images do get used in other disciplines. If you want to use the full “Ben system”, 2704 is the only sensible number to think of. 
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yes , If anyone here are new. I suggest you to try full 2 card system (2704)
Half 2 card system sometimes get trickier.
Yesterday I got 8, 9 images (total 18 cards) on a single loci starting with red colour first 
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52x52 will get you all possible pairs INCLUDING DOUBLES. So you’ll have pairs like Ace of Spades + Ace of Spades. This would be applicable if memorizing multiple decks shuffled together where you’d have duplicate cards that could be paired or if in a digital event where two random cards are paired and duplicates are allowed. This total is 2704.
52x51 gives the total pair combos for a SINGLE DECK without duplicate cards, 2652 pairs.
If you add a red or colorful joker and a black and white joker to the mix, the totals are 54x54 (multiple decks / duplicates) and 54x53 (single deck, no dupes), or 2916 and 2862 respectively.
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