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Affiliations: Wen-Fong Ke (correspponding author), Department of Mathematics, National Cheng Kung University, 1st, Dasyue Rd, East District, Tainan 701, Taiwan, e-mail: wfke@mail.ncku.edu.tw; Johannes H. Meyer, Department of Mathematics and Applied Mathematics, University of the Free State, PO Box 339, Bloemfontein, 9300, South Africa, e-mail: meyerjh@ufs.ac.za
