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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.
I can agree with you, however, the length of an interval in a mathematical sense does not depend on inclusiveness if we are talking about intervals over the real numbers, which is a fair assumption unless stated otherwise.