1. Department of Computer Science, Cihan University-Erbil, Kurdistan Region, Erbil, Iraq
2. Department of Mathematics, Hodeidah University, Hodeidah, Yemen
3. Department of Mathematics, Sana’a University, P. O. Box 1247, Sana’a, Yemen
4. Future University, New Cairo, Egypt
5. Department of Mathematics, College of Sciences and Humanities in Aflaj, Prince Sattam Bin Abdulaziz University, Riyadh, Saudi Arabia