A set of glyphs with a single style and shape comprise a font, and
a set of fonts covering several styles and sizes comprise a typeface.
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@seealso
Notation Reference:
@ref{Fonts},
Notation Reference:
@ref{mutable}.
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@node interface
@unnumberedsubsec interface
Notation Reference:
@ref{immutable}.
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@node output-def
@unnumberedsubsec output-def