wip dependency insertion

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@@ -896,6 +896,19 @@ OK.
 
 $\qed$
 
+\subsection{Foreign Inclusion}
+
+Consider some $D$ s.t. $\patchof{D} = \bot$.
+
+By Tip Contents for $R^+$, $D \isin R^+ \equiv D \isin R^-$.
+So by $\merge$, $D \isin C \equiv D \isin L$.
+
+xxx up to here, need new condition
+
+$D \neq C$.
+
+
+
 \section{Merge}
 
 Merge commits $L$ and $R$ using merge base $M$: