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\begin{figure}[h!]
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\centering
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\subfigure[First split]{\label{first_split}
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\scalebox{0.7}{
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\begin{tikzpicture}
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\node[draw,minimum height=3.8ex] (xa) {$\hspace{2em}xa\hspace{2em}$};
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\node[draw,minimum height=3.8ex, right=-0.03em of xa] (xxa) { $\hspace{5em}x - xa\hspace{5em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of xxa] (z) { $\hspace{21em}$ };
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(xa.north west) -- ($(xxa.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$x$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(z.north west) -- ($(z.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$z$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.north west)+(0em,3ex)$) -- ($(z.north east)+(0em,3ex)$)
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node[midway, above=0.6em]{$x @ z \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(z.south east)+(0em,0ex)$) -- ($(xxa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$(x - xa) @ z \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.south east)+(0em,0ex)$) -- ($(xa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$xa \in L_1*$};
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\end{tikzpicture}}}
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\subfigure[Max split]{\label{max_split}
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\scalebox{0.7}{
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\begin{tikzpicture}
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\node[draw,minimum height=3.8ex] (xa) { $\hspace{4em}xa\_max\hspace{4em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of xa] (xxa) { $\hspace{0.5em}x - xa\_max\hspace{0.5em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of xxa] (z) { $\hspace{21em}$ };
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(xa.north west) -- ($(xxa.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$x$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(z.north west) -- ($(z.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$z$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.north west)+(0em,3ex)$) -- ($(z.north east)+(0em,3ex)$)
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node[midway, above=0.8em]{$x @ z \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(z.south east)+(0em,0ex)$) -- ($(xxa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$(x - xa\_max) @ z \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.south east)+(0em,0ex)$) -- ($(xa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$xa \in L_1*$};
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\end{tikzpicture}}}
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\subfigure[Max split with $a$ and $b$ (the right situation)]{\label{ab_split}
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\scalebox{0.7}{
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\begin{tikzpicture}
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\node[draw,minimum height=3.8ex] (xa) { $\hspace{4em}xa\_max\hspace{4em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of xa] (xxa) { $\hspace{0.5em}x - xa\_max\hspace{0.5em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of xxa] (z) { $\hspace{21em}$ };
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(xa.north west) -- ($(xxa.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$x$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(z.north west) -- ($(z.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$z$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.north west)+(0em,3ex)$) -- ($(z.north east)+(0em,3ex)$)
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node[midway, above=0.8em]{$x @ z \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(z.south east)+(0em,0ex)$) -- ($(xxa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$(x - xa\_max) @ z \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.south east)+(0em,0ex)$) -- ($(xa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$xa \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xxa.south east)+(6em,-5ex)$) -- ($(xxa.south west)+(0em,-5ex)$)
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node[midway, below=0.5em]{$a \in L_1$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(z.south east)+(0em,-5ex)$) -- ($(xxa.south east)+(6em,-5ex)$)
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node[midway, below=0.5em]{$b \in L_1*$};
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\end{tikzpicture}}}
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\subfigure[Max split with $a$ and $b$ (the wrong situation)]{\label{ab_split_wrong}
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\scalebox{0.7}{
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\begin{tikzpicture}
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\node[draw,minimum height=3.8ex] (xa) { $\hspace{4em}xa\_max\hspace{4em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of xa] (xxa) { $\hspace{0.5em}x - xa\_max\hspace{0.5em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of xxa] (z) { $\hspace{21em}$ };
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(xa.north west) -- ($(xxa.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$x$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(z.north west) -- ($(z.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$z$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.north west)+(0em,3ex)$) -- ($(z.north east)+(0em,3ex)$)
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node[midway, above=0.8em]{$x @ z \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(z.south east)+(0em,0ex)$) -- ($(xxa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$(x - xa\_max) @ z \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.south east)+(0em,0ex)$) -- ($(xa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$xa \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xxa.south east)+(-3em,-5ex)$) -- ($(xxa.south west)+(0em,-5ex)$)
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node[midway, below=0.5em]{$a \in L_1$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(z.south east)+(0em,-5ex)$) -- ($(xxa.south east)+(-3em,-5ex)$)
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node[midway, below=0.5em]{$b \in L_1*$};
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\end{tikzpicture}}}
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\subfigure[Last split]{\label{last_split}
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\scalebox{0.7}{
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\begin{tikzpicture}
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\node[draw,minimum height=3.8ex] (xa) { $\hspace{4em}xa\_max\hspace{4em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of xa] (xxa) { $\hspace{0.5em}x - xa\_max\hspace{0.5em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of xxa] (za) { $\hspace{2em}za\hspace{2em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of za] (zb) { $\hspace{7em}zb\hspace{7em}$ };
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(xa.north west) -- ($(xxa.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$x$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(za.north west) -- ($(zb.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$z$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.north west)+(0em,3ex)$) -- ($(zb.north east)+(0em,3ex)$)
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node[midway, above=0.8em]{$x @ z \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(za.south east)+(0em,0ex)$) -- ($(xxa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$(x - xa\_max) @ za \in L_1$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.south east)+(0em,0ex)$) -- ($(xa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$xa\_max \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(zb.south east)+(0em,0ex)$) -- ($(zb.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$zb \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(zb.south east)+(0em,-4ex)$) -- ($(xxa.south west)+(0em,-4ex)$)
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node[midway, below=0.5em]{$(x - xa\_max)@z \in L_1*$};
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\end{tikzpicture}}}
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\subfigure[Structure transferred to $y$]{\label{trans_split}
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\scalebox{0.7}{
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\begin{tikzpicture}
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\node[draw,minimum height=3.8ex] (xa) { $\hspace{5em}ya\hspace{5em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of xa] (xxa) { $\hspace{2em}y - ya\hspace{2em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of xxa] (za) { $\hspace{2em}za\hspace{2em}$ };
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\node[draw,minimum height=3.8ex, right=-0.03em of za] (zb) { $\hspace{7em}zb\hspace{7em}$ };
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(xa.north west) -- ($(xxa.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$y$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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(za.north west) -- ($(zb.north east)+(0em,0em)$)
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node[midway, above=0.5em]{$z$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.north west)+(0em,3ex)$) -- ($(zb.north east)+(0em,3ex)$)
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node[midway, above=0.8em]{$y @ z \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(za.south east)+(0em,0ex)$) -- ($(xxa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$(y - ya) @ za \in L_1$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(xa.south east)+(0em,0ex)$) -- ($(xa.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$ya \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(zb.south east)+(0em,0ex)$) -- ($(zb.south west)+(0em,0ex)$)
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node[midway, below=0.5em]{$zb \in L_1*$};
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\draw[decoration={brace,transform={yscale=3}},decorate]
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($(zb.south east)+(0em,-4ex)$) -- ($(xxa.south west)+(0em,-4ex)$)
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node[midway, below=0.5em]{$(y - ya)@z \in L_1*$};
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\end{tikzpicture}}}
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\caption{The case for $STAR$}
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\end{figure}
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