Examples Input Problem Finite Set

\begin{question}
      \begin{variables}
        \number{a}{1/2}
        \number{b}{1/3}
        \number{c}{1/5}
      \end{variables}

      \text{\textit{Write down the set $A$ of numbers $\var{a}$, $\var{b}$, and
        $\var{c}$}:}
      \explanation{Explain that}
      \type{input.finite-number-set}
      \field{rational}
      \begin{answer}
        \text{$A =$}
        \solution{a, b, c}
      \end{answer}

    \end{question}

  \end{problem}

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