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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.
Tests are random, so it's normal an incorrect solution doesn't fail the same amount of tests on each trial.
For the rest, you should follow the track given by kemptosa.
It looks like you may be double counting some patients somehow, I would look at the expected and actual results for each test case.
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