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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.
The problem description is unhelpful -- doesn't mention anywhere that ranges of two integers (read as 14 and 15) should be output as separate integers instead of a range, and marks the solution incorrect if that isn't the case. Pls revise.