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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.
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It's a smart way to use the attributes defined in __init__ as functions (that's what the kata requires, which is not very pertinent since they'd rather be considered merely as properties entirely defined at the creation of the instance; it does not make much sense to have to calculate them again at each function call).