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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.
This solution is awesome but I don't understand it at all. I can understand how the split separates by odd numbers. But I don't understand why it doesn't remove the separator characters (i.e. why odd numbers don't get removed) and why it generates empty characters after each odd.