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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.
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It is good to know the existence of library as numpy, especially in industry and when you care about the performance, however, this task is made to challenge you reasoning skills by using basic syntax.
To be fair, a lot of challenges can be done by libraries then what is the point of completing them ?
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Exactly!