$ perl -l
use CGI;
my $queryParams = { a => [qw/ a >< a/], qw/ b b><b c c><c / };
print CGI->new( $queryParams )-> query_string;
__END__
c=c%3E%3Cc;a=a;a=%3E%3C;a=a;b=b%3E%3Cb