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Magician shows three different colored ropes ( Red Blue amp Green) and calls two spectators onto the stage. He gives each a color rope of his choice. Magician asks the spectators to tie each one in a circle with a genuine knot and he too does the same with his piece of rope. Without switching the ropes or tampering the knots he proceeds to link the solid rings of rope. Finally the spectators are allowed to untie the knots and verify that they (knots) are genuine.
