category Province
Group 1 Hainan, Ningxia, Tibet, Qinghai, Tianjin
Group 2 Inner Mongolia, Jilin, Xinjiang, Heilongjiang, Chongqing, Fujian, Gansu, Anhui, Hubei, Liaoning, Jiangxi, Guizhou, Guangxi, Yunnan, Shaanxi, Shanxi
Group 3 Jiangsu, Guangdong, Zhejiang
Group 4 Shandong, Henan, Sichuan, Hebei, Hunan
Group 5 Beijing, Shanghai