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No actually singles are released on one day earlier than their release date (Tuesdays) that's how Oricon gets its first day ranking on a Wednesday.
About the dual A-side thingie I think it's because if you have two songs on a single then the chances are that people disliking both songs is smaller. What I mean is if they put say fairyland as single A-side then it definitely couldn't have sold that much seeing how many people dislike this song, but alot of them likes alterna. I guess it kinda avoids the 'super selling' single and weak single situation.
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