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view ja/undo-simple.dot @ 1050:add323f1ff4e

1.6.2 finished,and first 2 paras of 1.6.3 refined
author Zhaoping Sun <zhaopingsun@gmail.com>
date Tue Nov 10 19:05:24 2009 -0500 (2009-11-10)
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1 digraph undo_simple {
2 "first change" -> "second change";
3 "second change" -> "back out\nsecond change";
4 }