added other systems to FAQ

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 <b>Is Helios the only system that provides this level of verifiability?</b>
-<p>No, there are other systems. Scantegrity and Punchscan provide true verifiability in paper-based voting systems. We like those systems, and we like the people behind those systems. VoteHere, a company that has since folded, was a pioneer in this area, too. The Helios System packs a number of innovations focused on enabling true verifiability for online elections to help everyone get a taste if this groundbreaking technology. But we are not the only game in town.</p>
+  <p>No, there are other systems. <a href="http://scantegrity.org">Scantegrity</a>, <a href="http://www.pretavoter.com/">Pret-a-Voter</a>, <a href="https://www.usenix.org/conference/evtwote13/workshop-program/presentation/bell">STARVote</a>, Wombat Voting, all provide true verifiability in paper-based voting systems. We like those systems, and we like the people behind those systems. VoteHere, a company that has since folded, was a pioneer in this area, too. The Helios System packs a number of innovations focused on enabling true verifiability for online elections to help everyone get a taste if this groundbreaking technology. But we are not the only game in town.</p>
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