\item For each $\hasdep$-maximal $\pd \isdirdep \pc$, find a merge base
$M \le W,\; \le \tipdy$ and merge $\tipdy$ into $W$.
That is, use $\alg{Merge}$ with $L = W,\; R = \tipdy$.
-(Dependency Merge.)
+(Base Dependency Merge.)
\item For each $S \in S^{\pcn}_i$, merge it into $W$.
That is, use $\alg{Merge}$ with $L = W,\; R = S,\; M = M^{\pcn}_i$.
Execute $\alg{Fixup-Base}(W,\pc)$.
+\subsubsection{Result}
+
+If all of that was successful, let $\tipcn = W$.
\subsection{$\alg{Recreate-Base}(\pc)$}
For each operation called for by the traversal algorithms, we prove
that the commit generation preconditions are met.
+\subsection{Base Dependency Merge, Base Sibling Merge}
+
+We do not prove that the preconditions are met. Instead, we check
+them at runtime. If they turn out not to be met, we abandon
+\alg{Merge-Base} and resort to \alg{Recreate-Base}.
+
+WIP WHAT ABOUT PROVING ALL THE TRAVERSAL RESULTS
+
\subsection{Tip Base Merge}
$L = W$, $R = \tipcn$.