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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.
You didnt even specify whether interval start and end are exclusive or inclusive.
Awful Kata description.
Should have added that BIG INT libraries are not allowed, otherwise this kata has no point.
Everyone is just using a library, ignoring the actual point of this kata.