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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.
I agree,
I simply wrote something quickly in the morning, but using INT_MIN is better.
And yeah, using the first product and avoiding magic numbers is probably the best option :)