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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.
divmod is useful here as it returns // and % in one call.
Using enumerate would add an automatic counter. It's the first time I've used it for myself rather than seeing other people's solutions and thinking "must remember to use that"!