UNIT 3_Question 2_Pham Thi Truc Ha: In the past the Chinese used chess games as keys into secret rooms or caves. They set up the chess board, moved some pieces and then left. Those who discovered the special rules to end the game would find out the key to the desired rooms or caves with valuable things, such as martial arts books, jewelry. Moreover, a vase of flowers or a pot of plants was sometimes employed as a key into an underground room in a house when it was turned left then right a numbered circles.

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