Set Operations: Venn Diagrams

The code that generates the previous PDF diagram:

\documentclass{standalone}
 
% Imported packages:
\usepackage{venndiagram} % Needed for drawing Venn diagrams

\begin{document}
\begin{venndiagram2sets}[labelNotAB={$U$}]
\fillA \fillB
\end{venndiagram2sets}%
\end{document}