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+\usepackage{enumitem}
+
+\makeatletter
+\newcommand*{\triviaenum}[1]{%
+ \expandafter\@triviaenum\csname c@#1\endcsname%
+}
+
+\newcommand*{\@triviaenum}[1]{%
+ $\ifcase #1 \or 1. \or \textrm{X}. \or 2. \or \textrm{\O}. %
+ \else\@ctrerr\fi$%
+}
+\AddEnumerateCounter{\triviaenum}{\@triviaenum}{3}
+\makeatother
+
+% Ø.%