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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.
Sample tests are usually a very small portion of tests that are run.
This just means that you haven't reached the end of test runner running all tests (due to timeout), so it wasn't sure how many tests there were in total. I was stuck in the same spot last time I tried it, but I know my code wasn't efficient at all, hence the timeout.