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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 have improved the wording in the description to now say: "Numbers should preserve their sign; i.e. a negative number should still be negative when reversed." This should be clear enough.