I'm exactly the same way with things. I can dial a phone number by physical memory- but i can't say the numbers out loud or write them on paper. I can write or type many words, but can't spell them out loud. For words, I have to write them out before hand and read off what I wrote. For phone numbers, I have to pretend to be dialing an invisible phone- it makes me look a wee bit mad I bet =P
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