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1
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the watch tower was protected by what
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3
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who did china try to keep out
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4
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how wide is the great wall of china
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5
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worlds largest man made structure the great wall
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7
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why was the wall built
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8
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what did the watchtowers do to signalan attack
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9
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which centuries was the great wall mostly built in
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2
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what was the road on top of the great wall use for
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6
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___ wall of china
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