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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.
IMMHO it would be simpler to map each month to a quarter as I did. It has O(1) efficiency, here you are iterating all the quarters and all the months if the given month is 12.