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	my ($self, $graph, $fh) = @_;
	while (my $line = <$fh>) {
		chomp $line;

		# End of vertexes section.
		if ($line =~ m/^#/ms) {
			next;
		}

		# Process OID.
		my ($line_oid, $line_label) = split m/\s+/ms, $line, 2;
		my @oid = split m/\./ms, $line_oid;
		my $last_oid;
		my $act_oid = $EMPTY_STR;
		foreach my $oid (@oid) {
			if ($act_oid ne $EMPTY_STR) {
				$act_oid .= $DOT;
			}
			$act_oid .= $oid;
			$graph->add_vertex($act_oid);
			if ($act_oid eq $line_oid) {
				if (! $line_label) {