\textbf{233--} In the graph, how many carbon atoms are connected to other carbon atoms and what type of bonds exist between them -- which compound has carbon atoms most similar to each other?
\begin{itemize}
\item[(1)] 3, benzene
\item[(2)] 4, benzene
\item[(3)] 3, cyclohexane
\item[(4)] 4, cyclohexane
\end{itemize}
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