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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 don't know much about re but this one liner is fine for this solution
Most elegant solution in my analysis "very clever"!
This comment is hidden because it contains spoiler information about the solution
This comment is hidden because it contains spoiler information about the solution
aha!