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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.
Timing out is not a kata issue. Your code is too slow.
Not so many, but it seems some people passed the random tests in Dart too. And yes, all test should pass in less than 12 seconds.