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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.
This is a good middle ground of performance, and readability.
I like the clever arithmetic. This might be the most efficient, as it doesn't use an intermediate collection.
Since it is known that the lowest divisor is 3, the range can start at 3.