Coincidence

TWO packs are required. Beforehand decide on any two cards
you will use. Steam the stamp off a new pack, take out the cards and reverse one of the two cards decided upon at about tenth place from the top, the other about tenth from the bottom. Replace the cards in the case and gum the stamp in position. Have this pack in your pocket. Take the two duplicates from a second pack and put them third and forth from the bottom. You are ready.
Riffle shuffle the pack without disturbing the four bottom cards and have a spectator cut the pack. Count the cards cut while the spectator counts the bottom part-give any plausible reason you please for the counting, it is really only to bring the four bottom cards of the lower part to the top. Show what you want him to do by taking the two top cards of his part, reversing them and pushing them partly into the heaps one in each. Take them out and insert them face down in your heap. Turn your back while the spectator takes the next two cards off his heap (these are the two you fixed beforehand), and inserts them face up, one in each heap. This done, turn around and take the scaled pack from your pocket. Have it opened and the cards removed. Let the spectator cut it about the middle. Pattering about the sympathetic nature of the cards, have him place his hands on top of the packets for a moment, then name the two cards. The cards are spread and the same cards are found reversed. Cards with white margins on the back must be used.