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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.
Just passed the kata version of the kata and everything seems to be OK. I think you are either misinterpreting the log in some way, or have some error in your solution keeping some state between runs.
Test case in
testWithOverlaps
is exactly the same as test in description, and it expects the same result. They are not different.