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Like fanmail mentioned, the main differences are:
-The rereleases have remixes on them, most of which are cut from the kanariya, appears, and Fly high singles.
-New artwork. In order to fit the new case sizes, the original cover is in the corner while the rest is a dfferent bg color for each release. Just check wiki to see the differences. =)
-8cm vs. 12 refers to the disc size. Japan used to release singles in 8cm format because they were cheaper and held less space. Eventually they switched back to 12cm, probably because remixes were becoming more popular and they wanted to lengthen the time on the CDs, and because people were abandoning the format. The cassette is a good comparison. Boys&Girls is Ayu's first 12cm single.
And yea, the 8cm are sold out and considered a collector's item now.
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