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You, Xiaoyu, North China University of Science and Technology Mathematical modeling Association(NCUSTMMA), North China University of Science and Technology, Tangshan, Hebei, 063000, China; School of Mechanical Engineering, Tangshan, North China University of Science
YU, Baorong, School of Insurance and Economics, University of International Business and Economics, Huixin Dongjie Chaoyang District, Beijing, 100029, China

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