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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.
Why would you treat double spaces any differently than single spaces? I don't think this is reason enough to raise an issue.
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Not a kata suggestion. A lot of katas have very biased upvotes, since the top-voted solutions are always at the top, they get upvoted constantly, but that does not mean they are "best practices".