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Kongming lock, also called the Eight Diagrams lock, Luban lock. Legend has it that it is a toy invented by Zhuge Liang and Kongming in the Three Kingdoms Period according to the principle of Eight Diagram metaphysics. It was widely circulated among the people. Get the attention of people gradually, it has profit to relax the body to develop mental power. It is a toy suitable for both young and old. Kongming lock looks very simple, but it is very difficult to complete the puzzle.