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aller à 46 min 30s pour le petit extrait de la leçon https://www.youtube.com/watch?v=tXenMtw3LU0 https://www.youtube.com/watch?v=6xz9gOZYVFs https://www.youtube.com/watch?v=SbTYcTJczOg&t=38s
https://www.youtube.com/watch?v=G6A72ufn3l4 https://www.youtube.com/watch?v=HBt0rNfxzMI&t=62s https://www.youtube.com/watch?v=DVO8HlGnNP4
https://www.youtube.com/watch?v=AJ7RQlyUIJU https://www.youtube.com/watch?v=AJ7RQlyUIJU https://www.youtube.com/watch?v=Q0CbN8sfihY