\begin{frame}{Chomsky Hierarchy}
  \begin{center}
    \begin{tikzpicture}[default,thin,nodes={rectangle,scale=.8,inner sep=1mm}]
      \def\chomskywidth{0.8cm}
      \def\chomskyadd{0.2cm}
      \begin{scope}
        \chomsky{7}{recursively enumerable}{fill=blue!80!green!5}
        \chomsky{6}{recursive}{fill=blue!80!green!10,dashed}
        \chomsky{5}{context-sensitive (CS)}{fill=blue!80!green!14}
        \chomsky{4}{deterministic CS}{fill=blue!80!green!18,dashed}
        \chomsky{3}{context-free (CF)}{fill=blue!80!green!22}
        \chomsky{2}{deterministic CF}{fill=blue!80!green!26,dashed}
        \chomsky{1}{regular}{fill=blue!80!green!30}
        
        \node [scale=1.2] at (0,-21mm) {Languages};
      \end{scope}
      \def\chomskywidth{0.8cm}
      \def\chomskyadd{0.1cm}
      \begin{scope}[xshift=40.5mm]
        \chomsky{7}{TM}{fill=green!90!blue!5}
        \chomsky{6}{terminating TM}{fill=green!90!blue!10,dashed}
        \chomsky{5}{LBA}{fill=green!90!blue!14}
        \chomsky{4}{DLBA}{fill=green!90!blue!18,dashed}
        \chomsky{3}{NPDA}{fill=green!90!blue!22}
        \chomsky{2}{DPDA}{fill=green!90!blue!26,dashed}
        \chomsky{1}{DFA \& NFA}{fill=green!90!blue!30}

        \node [scale=1.2] at (0,-21mm) {Automata};
      \end{scope}
      \def\chomskywidth{0.8cm}
      \def\chomskyadd{0.1cm}
      \begin{scope}[xshift=74mm]
        \chomsky{7}{unrestricted}{fill=cred!90!blue!5}
        \chomsky{5}{context-sensitive}{fill=cred!90!blue!14}
        \chomsky{3}{context-free}{fill=cred!90!blue!22}
        \chomsky{1}{right-linear}{fill=cred!90!blue!30}

        \node [scale=1.2] at (0,-21mm) {Grammars};
      \end{scope}
    \end{tikzpicture}
  \end{center}
\end{frame}