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Affiliations: Xiaoyou Chen, College of Science, Henan University of Technology, No. 100 Lianhua Road, Zhengzhou 450001, Henan, China, e-mail: cxymathematics@hotmail.com; Mark L. Lewis, Department of Mathematical Sciences, Kent State University, 233 MSB, 1300 Lefton Esplanade, P. O. Box 5190, Kent 44242-0001, Ohio, USA, e-mail: lewis@math.kent.edu
