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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 you had list included or used any different library, this could crash, because you are using keyword as a name for variable.
But keep it up!
Great job! Imo modulo is more readable but bit AND is cool as hell.