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A Card Trick
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The explanation of the card trick from the 'Scientific American' given on p. 15 of Vol. V of the Journal, is as follows:
(Diamonds) 1 2 3 4 5 6 7 8 9 10
(Hearts) 10 1 2 3 4 5 6 7 8 9
(Spades) 9 10 1 2 3 4 5 6 7 8
(Clubs) 8 9 10 1 2 3 4 5 6 7
Denote the position of any card in the above arrangement by (x, y) where x, y are the orders of the column and row to which it belongs counting from the left-hand column and top row respectively.
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