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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.
Fixed!
I'm not sure what your question is. It's specified clearly in the description it's the first character that you are looking for. Any unicode character counts. (Though, technically, I suppose the term codepoint would be more accurate, but I think enough people understand what a character is to get it.)