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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.
I agree about the bullet points layout.
In the example you gave though, "a white space" is one thing, "number of error for that letter in a field of 6" is another thing.
Maybe this would be clearer: "the number of errors as a left justified string of 6 characters long".
The white space is usually the default filling character in an aligned string (center, left or right).