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+\newcommand{\R}{\mathbb{R}}
+\newcommand{\N}{\mathbb{N}}
+\newcommand{\K}{\mathbb{K}}
+\newcommand{\Q}{\mathbb{Q}}
+
+\newcommand{\powerset}[1]{\mathcal{P}(#1)}
+\newcommand{\skp}[1]{\langle #1 \rangle}
+\newcommand{\restrictedto}[2]{{\left.\kern-\nulldelimiterspace #1 \vphantom{\big|} \right|_{#2}}}