The looped band

Cut a band, shaped as in the drawing on the left, out of a sheet of paper or other flexible material. Tape the end A to a table top or any large object. Manipulate the strip into the configuration shown below without removing end A from the table / object.



Have Fun!



Problem from:
Gardner, Martin. 1972. Mathematical Games. Scientific American, volume 226, no. 4, p. 100. 
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