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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.
Random test calls for negative int values (used std::cerr to see it). If I change an argument as unsigned int, it's no enough memory to write Roman representation. Very sad.