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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.
And on that site, do you see the number next to node version? That's 15, CodeWars doesn't support that version (yet). Node v12 is the latest ATM. (only v10 enabled for this kata)