Created by
Torbjørn T.
| \documentclass{article}
\usepackage{pagecolor}%
\usepackage{tikz}%
\begin{document}
\pagecolor{red!30}
\begin{tikzpicture}
\tikzset{mwe/.style={inner sep=1.15ex, text depth=0ex, text height=1ex, text width=0.5em, minimum size=0.5em}}%
\node (A) [mwe] at (0,0) {A};%
\node (B) [mwe] at (4,0) {B};%
\node (C) [mwe] at (0,4) {C};%
\node (D) [mwe] at (2,-4) {D};%
\path (A) -- node[text height=1.25ex] (AB) {ab} (B);
\path (C) -- node[text height=1.25ex] (CD) {c} (D);
\draw[line width=0.25mm,-] (A) -- (CD) -- (AB) -- (B);%
\draw[line width=0.25mm,-] (C) -- (CD) -- (D);%
\end{tikzpicture}
\end{document}
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