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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.
You absoluteley can!
The " " character is just like any of the other characters (indexed from the matrix or not). The author probably just wanted to mark the end of a word with a " " for clarity.