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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.
Normally no, because it keeps its value between several calls, so it'll work in the first one but will fail in all the others if not being reset.