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de-embedding.

De-embedding the font does NOT remove it from the PDF document, it
just removes references to it.  To get a size reduction by throwing
away unused font data, you should use the following code sometime
after this method.

  $self->cleanse();

For reference, the standard fonts are C<Times-Roman>, C<Helvetica>, and
C<Courier> (and their bold, italic and bold-italic forms) plus C<Symbol> and
C<Zapfdingbats>. (Adobe PDF Reference v1.4, p.319)

=cut

sub deEmbedFont
{
   my $self = shift;
   my $pagenum = shift;
   my $fontname = shift;
   my $basefont = shift;