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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.
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CodeWars is a relatively safe environment for running code, obviously, but relying on an eval/exec call (especially if you're leaving it bare to the user of a function) should always evoke a deep, finger-curling pain.