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• Current address : Erdo¼gan ¸Sen: Department of Mathematics, Namık Kemal University, 59030, Tekirda¼g, Turkey
• E-mail address : erdogan.math@gmail.com
• Current address : Azad Bayramov: Azerbaijan State Pedagogical University, 1000, Baku, Azer- baijan
• E-mail address : azadbay@gmail.com