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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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I love how this kata force me to think about performance. I first created a rather naive solution that passed all tests, but failed on the time constraint. I then had to really think about how I could make it faster, so that was great. My final solution was waaay faster than my original one :)