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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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Please don't post spoilers without using Spoiler flag, as your comments are visible to everyone on front page - even those who haven't solved the kata; knowing the name of "the correct" algorithm or data structure to use is basically 80% of the way towards a solution in many cases.