You now take a set in each hand, presenting them to the two
persons, requesting them to replace the drawn cards. You must
pretend to present to each person the set from which he drew his
card, but in reality you present the red set to the person who
drew the black card, and the black set to the person who drew the
red card.
Each person having replaced his card, you get each set shuffled.
Then you take them in hand, and by running them over you easily
find the red card amongst the black, and the black card amongst
the red.
Of course you will have prepared the sets beforehand, and take
care to alter the arrangement as soon as possible after the
trick. But you can prepare the pack in the presence of others
without their detecting it. Distribute the cards by dealing
according to the two colours; take them up, and having placed the
red set a little projecting over the black, set them down, and,
pretending to cut them, separate the sets.
6. Twenty cards being arranged upon a table, a person thinks of
two, and you undertake to guess them.
Lay out twenty cards of any kind, two by two,
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and request a party to think of two in a line; that is, one of
the ten sets formed by the twenty cards.
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