1. Department of Mathematics, College of Computer Sciences and Mathematics, Tikrit University, Tikrit 34001, Iraq
2. College of Computer Science and Engineering, Taibah University, Yanbu 46421, Saudi Arabia
3. Computer Science Department, Faculty of Science, Abdelmalek Essaadi University, Tetouan 93000, Morocco
4. Department of Computer Science, Faculty of Science, Amran University, Amran 9677, Yemen