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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.
Should first of all try easy examples, such as 9, 15, 21 etc. Most of the solutions only check for modulo 2, which only checks for odd/even.
Try it with 9 (which is not a prime number) => buggy :D