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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.
Do you use any global variables, or static variables, or whatever it's called in your language, which might carry some state between executions of your solution?
Did you try to run in your IDE more than one test case in one go?