🪦Actually: in Practical SGML, chapter 14, it says that EMPM came *before* the SGML standard. So it's possible that the characters defined in the SGML standard come from EMPM, then MMF is published with more characters, and finally TR 9573-13 adopts the extra characters, which explains the incongruency between the entity sets of SGML and of TR 9573-13
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