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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.
Common feeling for me, but that's one of the things that pushes me to practice.
For some reason the Ruby version wouldn't let me use Math::sqrt. Had to do it the long way around.
The descrippption says:
The Ruby sample test assertions have an incorrect test. The working set must be 0 <= m <= n, but one of the tests has m as 10,000 and n as 9,950.
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