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1 Ferghana State University and V.I.Romanovskiy Institute of Mathematics, Tashkent, Uzbekistan. E-mail: erkinjon@gmail.com
2 University of Geological Sciences, Tashkent, Uzbekistan. E-mail: sobirovzar@gmail.com
3 V.I.Romanovskiy Institute of Mathematics, Tashkent, Uzbekistan. E-mail: jonibek.16@mail.ru