--- a/blob1.tex	Mon Mar 29 22:35:00 2010 -0700
+++ b/blob1.tex	Tue Mar 30 16:29:32 2010 -0700
@@ -44,6 +44,7 @@
 On the other hand, if you are only going to read this paper once,
 {\bf then don't read this version,} as a more complete version will be available in a couple of months.
 
+\nn{maybe to do: add appendix on various versions of acyclic models}
 %\tableofcontents