https://uomosul.edu.iq/computerscience/%d8%aa%d8%af%d8%b1%d9%8a%d8%b3%d9%8a-%d9%81%d9%8a-%d9%83%d9%84%d9%8a%d8%aa%d9%86%d8%a7-%d9%8a%d9%86%d8%b4%d8%b1-%d8%a8%d8%ad%d8%ab%d8%a7%d9%8b-%d8%b9%d9%84%d9%85%d9%8a%d8%a7%d9%8b-%d9%81%d9%8a-2/