\begin{tikzpicture}[scale=0.8]
        \begin{scope}[shift={(0,0)}]        
            \node (p0) at (-1,0) {$(+,0)$};
            \node (0p) at (1,0) {$(0,+)$};
            \node (pp) at (-1,2) {$(+,+)$};
            \node (pn) at (1,2) {$(+,-)$};
            
            \draw (p0.north) -- (pp.south);
            \draw (p0.north) -- (pn.south);
            \draw (0p.north) -- (pp.south);
            \draw (0p.north) -- (pn.south);
        \end{scope}
        \begin{scope}[shift={(8,0)}]
                    \node (min) at (0,-1.5) {$\varnothing$};

        
            \node (p0) at (-3,0) {\footnotesize$(+,0)$};
            \node (0p) at (3,0) {\footnotesize$(0,+)$};
            \node (pp) at (-1,0) {\footnotesize$(+,+)$};
            \node (pn) at (1,0) {\footnotesize$(+,-)$};
            
            \node (p0-pp) at (-4,2) {\footnotesize$(+,0)<(+,+)$};
            \node (p0-pn) at (-1,2) {\footnotesize$(+,0)<(+,-)$};
            \node (0p-pp) at (2,2) {\footnotesize$(0,+)<(+,+)$};
            \node (0p-pn) at (5,2) {\footnotesize$(0,+)<(+,-)$};

	\draw (min.north) -- (p0.south);
		\draw (min.north) -- (0p.south);
	\draw (min.north) -- (pp.south);
	\draw (min.north) -- (pn.south);
            \draw (p0.north) -- (p0-pp.south);
            \draw (p0.north) -- (p0-pn.south);
            \draw (0p.north) -- (0p-pp.south);
            \draw (0p.north) -- (0p-pn.south);
            \draw (pp.north) -- (p0-pp.south);
            \draw (pp.north) -- (0p-pp.south);
            \draw (pn.north) -- (p0-pn.south);
            \draw (pn.north) -- (0p-pn.south);
        \end{scope}
        
    \end{tikzpicture}
