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A rope is shown to have 2 ends and with a little tug, the ends have morphed into 3 ends and then 4 ends.
The 4 ends vanish as quickly as they appeared, leaving the rope with the normal 2 ends.
The magician then ties a knot in the middle of the rope and the audience is asked how many knots they see.
They answer "1" and then the magician shows that there are actually 3 bringing the trick to a close.