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#!/usr/bin/perl5
use CGI qw/:standard/;
...
                            );
print "Content-Type: text/html\n\n";
 print "Set-Cookie: $c1,$c2,$c3\n";

#!/usr/bin/perl5
use CGI qw/:standard/;
...
print "Content-Type: text/html\n\n";
print $ENV{HTTP_COOKIE};