The worlds first drainage system was build by the people of

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The world’s first drainage system was build by the people of
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History

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SSC

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0,159,11,7,159,1,3

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{'first drainage system': [1, 0, 0, 0], 'mesopotamian civilization': [1, 0, 0, 0], 'egyptian civilization': [2, 0, 0, 0], 'indus valley civilization': [11, 1, 3, 4], 'chinese civilization': [1, 0, 0, 0]}