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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.
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Excellent solution!
This is a clever use of exceptions, though I would avoid this in production code. Raising exceptions is costly, and also if "a" happens to be a long string you would be creating a string 50 times larger.
Beautiful
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