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4×4 Lock Problem

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The object of this logic puzzle is to align all the "keys" vertically. This vertical configuration can be achieved from any initial starting position. Click on a key to change the orientation of every key in the same row and column.

Contributed by: Bryce Luna (August 2012)
Open content licensed under CC BY-NC-SA

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This Demonstration is based on a Bay Area Mathematical Olympiad problem.

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