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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 agree, definitely need more test cases. My commit solved all the tests in the test cases, also the example you provided:
[9,1,10,80]
When I submit I passed all tests except one where it expects to return true. I am scratching my head trying to figure out what cases when true have I missed. Any suggestions on what to do to expand the test cases?