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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.
very easy to read solution
wat
Easy to read, but it's O(n^2) and there's an even shorter solution that's O(n).
You should improve the instructions, they're not clear at all.