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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.
Problem statement does not clearly define what to return if not divisible by 3 or 5. Although sample cases do show to return given number, that should be stated when other returns are defined.