- clear
- input str6 地区 byte id int year float gdp
- "北京" 1 2013 19800.8
- "北京" 1 2014 21330.8
- "北京" 1 2015 23014.6
- "北京" 1 2016 25669.1
- "天津" 2 2013 14442
- "天津" 2 2014 15726.9
- "天津" 2 2015 16538.2
- "天津" 2 2016 17885.4
- "河北" 3 2013 28442.9
- "河北" 3 2014 29421.2
- "河北" 3 2015 29806.1
- "河北" 3 2016 32070.4
- end



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