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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.
Read the description again, there are overlapping intervals there, and that exact case is explained there.
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Why do you say so? It has indeed its logic, otherwise how could it be completed more than 12k times?
Not an issue, neither of those is the input, print it if you want to know what is was.
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