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\draw (1.6,-0.8) node{$s_{24}$};
\draw (-0.2,-1.2) node[right=-2bp]{$S_3$:};
\draw (0.4,-1.2) node{$s_{31}$};
\draw (0.8,-1.2) node{$s_{32}$};
\draw (1.2,-1.2) node{$s_{33}$};
\draw (1.6,-1.2) node{$s_{34}$};
\draw (-0.2,-1.6) node[right=-2bp]{$S_4$:};
\draw (0.4,-1.6) node{$s_{41}$};
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\draw (1.2,-1.6) node{$s_{43}$};
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\end{tikzpicture}%

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