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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.
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In kata description should be mentioned what return in case a new health is negative or state tgat heakh can be also a negative number.
Instructions are not clear and in my opinion not correct. However I solved it. For definition of food variables look at expected test values that should be returned. For a total price variable just use amounts of foods and prices mentioned in instructions.