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import pandas as pd
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df_data = {'pais': ['Brasil', 'Argentina', 'Argentina', 'Brasil', 'Chile', 'Chile'],
'ano': [2005, 2005, 2006, 2006, 2007, 2008],
'populacao': [170.1, 30.5, 32.2, 172.6, 40.8, 42.0]}
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df = pd.DataFrame(df_data)
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print(df)
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