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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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Yes. Think less algorithmically and more mathematically. It's possilbe to solve this with only one semicolon. My advice is to think carefully about relations between the length of a set and its power-set counterpart.