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use strict;
use warnings;
use CGI qw(:standard);
...
    hidden(-name => "s3cr37", -value => Data::UUID->new->create_str),
    end_form(),
    end_html();

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<!DOCTYPE html
        PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
         "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
...
<input type="text" name="testing"  /><input type="hidden" name="s3cr37
+" value="7D632A06-1A7B-11DF-B0FC-8F43FFA00377"  /></form>
</body>
</html>