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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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Its part of a template literal. room${i} would be room0 on the first iteration of the loop and then room1 on the next etc.
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