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If the concert happened on Saturday, the sales probably wouldn't probably have taken an upturn until the next day. What's probably happening is that there are Ayu fans who are taking up this 4 version offer or they are organizing themselves to buy the single.
All I know is, that is a very strange daily chart value, considering Ayu's sales trajectory for the rest of the week. I don't know if a 4 version gimmick alone is enough to boost sales by over 10K...
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