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• Current address : Vishnu Narayan Mishra (Corresponding author): Department of Applied Mathematics and Humanities, S. V. National Institute of Technology, Ichchhanath Mahadev Du- mas Road, Surat-395 007 (Gujarat), India, L. 1627 Awadh Puri Colony Beniganj, Phase-III, Opposite - Industrial Training Institute (I.T.I.), Ayodhya Main Road, Faizabad, Uttar Pradesh 224 001, India
• E-mail address : vishnu_narayanmishra@yahoo.co.in; vishnunarayanmishra@gmail.com
• Current address : Prashantkumar Patel: Department of Applied Mathematics and Humanities, S. V. National Institute of Technology, Ichchhanath Mahadev Dumas Road, Surat-395 007 (Gu- jarat), India, Department of Mathematics, St. Xavier’s College(Autonomous), Ahmedabad-380 009 (Gujarat), India
• E-mail address : prashant225@gmail.com