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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.
Because the kata got retired, so you can't submit a solution anymore, though you can freely look at others' solutions now.
Resolved.
Thanks for the notification, this means my code is wrong. Dm me on one of the Gitter channels. https://gitter.im/Codewars/codewars.com/kata-solving-help# I'm listed as ALowVerus