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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.
If you change tests in a way which makes existing solutions not pass anymore, then such solutions will be marked as obsolete. However, users who submitted them will not lose any points. It is generally OK to add tests and invalidate some solutions if tests are incorrect and do not conform to spec.
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