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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.
Your answer is really clear and your replacement of basis is smart, you explained me my algorithm after 2 years of forgetting, thank you :)
You could use a set, which I belive has constant lookup time too
Can someone explain this solution?