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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.
haha yeah I learnt that recently actually
I like the for/let num of integers thing you did, I completely forgot about that syntax!