Purity (or lack thereof). -- This is getting automagic grading RSN.
An earlier version of this test was read out at the GeekFest.
The invitation extends to students (we can fudge on this) who are geeks, are known as geeks, or are friends of geeks. Basically, if you know me or you know somebody who knows me, or even if you have just seen us on ncsu.soc, or if I sent you an invitation, just show up. Pretty much means anybody who reads this should come to the fest.