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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.
Using symbols as keys for the hashes indeed would make more sense.
Marked your comment "spoiler" since this got rid of the annoying alert you put up.
It seems, you just accidentally broke the codewars