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  • 1 Department of Applied Mathematics and Informatics, Research Institute of Applied Mathematics, Henan Polytechinc University Jiaozuo City, Henan 454003, China Jiaozuo City, Henan 454003, China
  • 2 Department of Mathematics, Jiaozuo Teacher's College Jiaozuo City, Henan 45001, China Jiaozuo City, Henan 45001, China
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