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    \item{On Unix-alikes:}{
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    \item{On Unix-alikes:}{
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  In a UTF-8 locale any Unicode character can be entered, perhaps as a
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  In a UTF-8 locale any Unicode character can be entered, perhaps as a
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  \samp{\\uxxxx} or \samp{\\Uxxxxxxxx} escape sequence, but the issue is
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  \samp{\\uxxxx} or \samp{\\Uxxxxxxxx} escape sequence, but the issue is
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  whether the graphics device is able to display the character.  The
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  whether the graphics device is able to display the character.  The
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  widest range of characters is likely to be available in the
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  widest range of characters is likely to be available in the
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  \code{\link{X11}} device using cairo: see its help page for how
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  \code{\link{X11}} device using \I{cairo}: see its help page for how
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  installing additional fonts can help.  This can often be used to
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  installing additional fonts can help.  This can often be used to
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  display Greek \emph{letters} in bold or italic.
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  display Greek \emph{letters} in bold or italic.
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  On macOS the \code{\link{quartz}} device and the default system fonts
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  On macOS the \code{\link{quartz}} device and the default system fonts
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  have quite large coverage.
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  have quite large coverage.