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What are the codes of A 1, B7 and A6 ... What does Yili's 250ML boxed milk beverage stand for? What's the difference between a, b and c?

Origin of Yili high calcium milk: A 1 Jinchuan, Inner Mongolia, A3 Wulanchabu, A4 Bayannaoer, Inner Mongolia, A 12 Wuzhong, Ningxia, B2 Zhaodong Heilongjiang, B3 Daqing Heilongjiang, B6 Fuxin Liaoning, C 1 Dingzhou, Hebei, C2 Langfang Hebei, C9 Tangshan Hebei, and C1.