https://blogs.e-me.edu.gr/gfachirid/2020/12/13/scratch-%ce%b4%ce%b7%ce%bc%ce%b9%ce%bf%cf%85%cf%81%ce%b3%ce%af%ce%b1-%cf%80%ce%b1%ce%b9%cf%87%ce%bd%ce%b9%ce%b4%ce%b9%ce%bf%cf%8d-%ce%bf-%ce%ba%ce%b1%cf%81%cf%87%ce%b1%cf%81%ce%af%ce%b1%cf%82/