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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.
Why would that be necessary? Task states, that you're given words and you don't need to sanitize them. There are 100+ more unnecessary things he could do, what's the point of mentioning them?
Please use spoiler flag next time, your post was visible in the homepage's discourse.