DI 32 annual income of bachelor degree holders in different fields
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DI 31 nighttime sleep, daytime sleep and total sleep for baby
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DI 30 the process of disposal recycling
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DI 29 annual per capita meat consumption in kilograms from 1961 to 2009
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DI 28 temperature variations, carbon dioxide and dust concentration thousands of years ago
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DI 27 the securitization market activity from 2000 to 2009
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DI 26 the proportion of UK citizens in different age groups from 1911 to 2011
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DI 25 two flags with very similar designs
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DI 24 how oxbow lakes are formed
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DI 23 a pyramid diagram depicting Maslow’s “Hierarchy of Needs”
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