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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.
Tricky question but easy to code
This is very similar problem, which is asked in hackerrank 10 days of javascript. Might be useful