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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
#1 la transformation en set + la différence des 2 set.
Super! Petite optimisation possible : tu utilises à 2 reprises la len() de only1 et only2 tu pourrais la garder en mémoire à la place d'appeler la fonction 2 fois chaque.