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Author notes

1. Zohra Benkamra, Benchikh Lehocine Ghanem and Mounir Tlemcani contributed equally to this work.

1. Department of Mathematics, University of Sciences and Technology of Oran Mohamed Boudiaf, Oran, 31000, Algeria

   Zohra Benkamra, Benchikh Lehocine Ghanem & Mounir Tlemcani

Correspondence to Mounir Tlemcani.

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