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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.
390 guys passed the C++ kata (see the top of the page), I just tried a few solutions and all worked fine. I don't see any mix in the vectors.