Following, because DS9 has a similar, but possibly different, problem. He knows the alphabet (i.e. can sing the ABC song), and knows how to write all his letters. But he cannot alphabetize easily, and does not know the alphabet order well without singing the ABC song. Some he knows (e.g. E comes after B), but I don't think he knows that M comes before S without giving it a lot of thought.

I haven't tried timing his writing, but perhaps that would be a good idea.