Thu, 21 Aug 2014 15:10:53 +0100 Christian Urban added handout
Fri, 18 Apr 2014 21:05:07 +0100 Christian Urban updated so that it works with more recent versions of Ruby
Tue, 10 Dec 2013 17:48:15 +0000 Christian Urban bug found by Andres
Thu, 05 Dec 2013 10:29:35 +0000 Christian Urban added
(0) -100 -30 -10 -4 +4 +10 +30 +100 +300 tip