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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.
Best example of a best practice that I've yet seen on this site.
This comment is hidden because it contains spoiler information about the solution
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I moved away from using reduce to keep the solution append-only, but that bias is probably unjustified.