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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.
uh... how did this pass?
Should fail on overlapping intervals.
Well, probably should have revised to remove the assertion at the beginning, and not sure if the last check is needed either.