https://blogs.e-me.edu.gr/gfachirid/2021/03/17/%cf%80%cf%89%cf%83-%ce%bd%ce%b1-%cf%86%cf%84%ce%b9%ce%b1%ce%be%cf%89-%ce%b5%ce%bd%ce%b1-quiz-%cf%83%cf%84%ce%bf-scratch/