Rostam K. Saeed

Department of Mathematics, College of Science-Salahaddin University/Erbil, Halwer-Kurdistan Region, Iraq

Karwan H.F.Jwamer

Department of Mathematics, School of Science -Sulaimani University, Sulaimani -Kurdistan Region, Iraq

Delan O. Salem

Department of Mathematics, College of Science-Salahaddin University/Erbil, Halwer-Kurdistan Region, Iraq

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