The great wall is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to-west line across the historical northern borders of china to protect the chinese states and empires against the raids and invasions of the various nomadic groups of the eurasian steppe. someone wanted to know the end of this wall, but he found many strange mysteries that are stored along the walls. good luck and have fun!
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