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What's the difference between single signature and double signature of Aaron's new album?
Single signing generally refers to the signing and countersigning after the official release. This time, it may still be a piece of cardboard or a lyric book. The double signing is signed twice before the purchase signing ceremony and after the official release. The pre-purchase sign is a piece of cardboard, signed in Aaron's existing map, and the other signature is the same as the single sign.