Thu, 24 Feb 2011 00:34:45 +0000 urbanc added hocroft and ullman book
Tue, 22 Feb 2011 12:43:05 +0000 urbanc three typos
Mon, 21 Feb 2011 03:35:39 +0000 urbanc one further polishing
Mon, 21 Feb 2011 03:33:27 +0000 urbanc final final polishing
Mon, 21 Feb 2011 03:30:38 +0000 urbanc final polished
Mon, 21 Feb 2011 02:33:05 +0000 urbanc chunhan's comments
Sun, 20 Feb 2011 18:58:34 +0000 urbanc minor change
(0) -100 -30 -10 -7 +7 +10 +30 +100 tip