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\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes,arrows,fit}
% \usetikzlibrary{calc,positioning}
\usepackage{tikz}
\begin{document}
\tikzstyle{plain}=[rectangle,thin,fill=white,align=left, minimum size=1cm,draw=gray!80,rounded corners=2pt]
\begin{tikzpicture}[>=latex,text height=1.5ex,text depth=0.25ex]
\matrix[row sep=0.4cm,column sep=1cm,,ampersand replacement=\&]{
\node(emptyLeft) [scale=0.7] {}; \& \& \node(emptyRight) [scale=0.7] {}; \\
\& \node(H) [plain] {$H_{1}\cap H_{2}\cap H_{3}$}; \& \\
\node(H12) [plain] {$H_{1}\cap H_{2}$}; \&
\node(H13) [plain] {$H_{1}\cap H_{3}$}; \&
\node(H23) [plain] {$H_{2}\cap H_{3}$}; \\
\node(H1) [plain] {$H_{1}$}; \&
\node(H2) [plain] {$H_{2}$}; \&
\node(H3) [plain] {$H_{3}$}; \\
\& \node(minimalText) {Minimal hypotheses}; \\
};
\path[->] (H) edge[thick,draw=blue!75,fill=blue!75] (H12);
\path[->] (H) edge[thick,draw=blue!75,fill=blue!75] (H13);
\path[->] (H) edge[thick,dashed] (H23);
\path[->] (H12) edge[thick,draw=blue!75,fill=blue!75] (H1);
\path[->] (H12) edge[thick,dashed] (H2);
\path[->] (H13) edge[thick,draw=blue!75,fill=blue!75] (H1);
\path[->] (H13) edge[thick,dashed] (H3);
\path[->] (H23) edge[thick,dashed] (H2);
\path[->] (H23) edge[thick,dashed] (H3);
\node (minimalBox) [dashed,draw=black!50,fit = (H1.north west) (minimalText.south) (H3.south east)] {};
\node (compositeBox) [anchor=south,inner sep=0.7em,dashed,draw=black!50,fit = (emptyLeft.north) (H12.south west) (H23.south east)] {};
\node (compositeText) [anchor=base,draw=none,fit = (emptyLeft.north west) (emptyRight.south east)] {Composite hypotheses}; %%\vspace*{-1em}
\end{tikzpicture}
\end{document}
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