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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.
sortedcontainers is a 3rd party library & is not available on Codewars.
You'll need to implement the functionality yourself.