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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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Crash in get_concentration if self.amount is 0
I also detail the input argument in the description
Thanks for yopur feedback.
I added some random tests
Returns incorrect result with '-(-4)'
Very good...but what is the interest of TypeError.new compared to TypeError?