rendre cette page de test invisible et non publiée
Update cheatsheet.en.md See merge request m3p2/courses!17
Update cheatsheet.es.md See merge request m3p2/courses!15
modif thin lens French See merge request m3p2/courses!14
Also remove all the .DS_Store files.
Update textbook.es.md See merge request m3p2/courses!12