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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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To those defending it based on readability, using += on a String in a loop is both a performance anti-pattern and not more readable than using a StringBuilder with StringBuilder.append in place of += on a String.