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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.
Nice, this makes it easily generalizable to any number of divisors.
When a string is passed to a boolean evaluation, the empty string '' returns False. Any non-empty string returns True. So "not string" is True if the string is non-empty, False if empty.