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df5 = pd.read_sql('''SELECT *,to_char(year,'9999')years FROM CO_DEUX WHERE code LIKE 'USA' AND year BETWEEN 1980 AND 2017 OR code LIKE 'CHN' AND year BETWEEN 1980 AND 2017;''',con=co)
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df6 = pd.read_sql('''SELECT *,to_char(year,'9999')years FROM CO_DEUX WHERE code LIKE 'USA' AND year BETWEEN 1980 AND 2017 OR code LIKE 'CHN' AND year BETWEEN 1980 AND 2017;''',con=co)
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