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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.
Not an issue
Perhaps you should include tests where damage is greater than health or specify that the test case is not possible.
It should be specified, whether there could be negative numbers input in damage and also whether there are some restrictions on available health (e.g. min = 0, max = 100).