2.1.1134 Part 4 Section 4.3.1.9, embeddedFontLst (Embedded Font List)
a. The standard states that the font data is referenced within the embeddedFont element.
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PowerPoint further requires that the typeface of each embeddedFont element shall be unique.
b. The standard states that the embeddedFontLst element specifies a list of fonts that are embedded within the corresponding presentation.
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PowerPoint further requires that all of the fonts specified in this list shall be used in this presentation.