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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.
if it requires please do not hesitate, for example a formula or bulit in fuction the goal is to learn
I think it doesn't work properly when the last is a date in December and today is a date in January
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This comment is hidden because it contains spoiler information about the solution