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Big surprise ending!
The audience thinks they know how the strings get longer and shorter.
Freely show two sticks with tassels on the ends.
One stick has a long cord and the other a short cord.
When magician pulls the short cord, the long cord simultaneously becomes short.
Repeat this unexplainable feat several times.
The audience think the cord is connected to the two sticks but magician separates the sticks.
The cord still moves as if they were connected.