Because I often have the urge to simplify things, I quickly put together a Guid generator site. This page will generate any number of GUID’s for you. Jimiz GUID Generator. I was able create the number I needed (20) quickly. Give it a try, create some GUID’s.
If you don’t know what a GUID (Globally Unique IDentifier) is, have a look at wikipedia. http://en.wikipedia.org/wiki/Globally_unique_identifier