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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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People will need to know what language you're asking about before anyone can answer that. Perhaps try posting your code as well (with markdown formatting and a spoiler tag) and you might get more targted help.