Remove the Empirical status subsection (small-n table)

Drop the n<=9 bridge-derived classification table and its surrounding
discussion; the n=21 boundary case now follows directly from the
trivial-below-21 observation.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

papers/even_level_graph_generators/paper.tex

@@ -334,38 +334,6 @@ $n = 21$ and there are exactly $6$ of them. Below $n = 21$ every
 maximal planar graph is an intertwining tree, which is why the
 disjunction holds trivially in that range.
 
-\subsection*{Empirical status}
-
-For each isomorphism class of maximal planar graphs on $n$ vertices,
-we ask whether (i) some isomorphic representative is a bridge-derived
-level graph of some Even Level Graph, and/or (ii) it is an intertwining
-tree. The conjecture holds for the class iff at least one of (i), (ii)
-holds. Below $n = 21$ condition (ii) holds for \emph{every} class, so
-the table mainly records how far the bridge-derived disjunct (i) reaches
-on its own. We classified bridge-derivability exhaustively for
-$n \le 9$, where every backward bridge-orbit can be enumerated in full.
-
-\begin{center}
-\begin{tabular}{rcccccc}
-$n$ & \# iso & bridge only & inter.\ only & both & missing & status \\\hline
-$6$  & $2$    & $0$ & $0$  & $2$    & $0$ & holds \\
-$7$  & $5$    & $0$ & $1$  & $4$    & $0$ & holds \\
-$8$  & $14$   & $0$ & $2$  & $12$   & $0$ & holds \\
-$9$  & $50$   & $0$ & $14$ & $36$   & $0$ & holds \\
-\end{tabular}
-\end{center}
-
-\noindent
-Here ``bridge only'' counts classes that are bridge-derived but not
-intertwining trees, ``inter.\ only'' the reverse, and ``both'' the
-intersection; ``missing'' counts classes that are neither (a
-counterexample). The ``bridge only'' column is $0$ throughout this range
-precisely because every class is an intertwining tree for $n \le 20$;
-the ``inter.\ only'' counts ($1,2,14$) are the classes that the
-bridge-derived disjunct alone does not yet reach, showing that
-bridge-derivability is strictly weaker than ``intertwining tree'' here
-and that the two disjuncts genuinely complement one another.
-
 \subsection*{The boundary case $n = 21$}
 
 The first triangulations that are \emph{not} intertwining trees are the