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• Department of Mathematics Tianjin Polytechnic University No. 399 Binshuixi Road, Xiqing District Tianjin, P.R.China e-mail: daishaojun@tjpu.edu.cn Kun Zhao School of Science, Jiamusi University Jiamusi, Heilongjiang, P.R.China e-mail: zhaokun197808@126.com