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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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What about the case when h < window?
The h is higher than 0 so it will pass the first condition, but the mother will never see the ball falling from the window, and in this case result should be 0 and not 1