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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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Super! First time I come across 'tr'
The Ruby testcases do not seem to be correct. I receive the error that hamming(385) should be 262144, but the correct answer is 259200. 262144 is hamming(386).