Patrol 
Added: Monday, July 28, 2008 by Eric Garcia - University of Washington
        Tags: Asymmetric, Indefinite, SocialNetwork
  AmazonBinary 
Added: Tuesday, March 10, 2009 by Yihua Chen - University of Washington
        Tags: Asymmetric, Indefinite, Small, Sparse
  Amazon47 
Added: Tuesday, May 27, 2008 by Eric Garcia - University of Washington
        Tags: Asymmetric, Indefinite, Small, Sparse