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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.
Different languages have different language features.
Also, this is not a suggestion ;-)
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I think none should't work on infinite lists, because you have to evaluate every item in the list whether they are True or False.