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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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I the last practice tests, there were as many negative 1's as positive. My program first detected the negative and so gave a wrong answer. If the kata supports negative numbers I think it would be really cool! ;)