"
  We start with the **normal** mode.

? \QALabel{Q:normal-1}
  Question.

:
  Answer to \QARef{Q:normal-1}.

? \QALabel{Q:normal-2}
  Question.

:
  Answer to \QARef{Q:normal-2}.

"
  Now start the **multiple question** mode.

\EnableMultipleQuestion

? \QALabel{Q:multi-1}
  First question.

? \QALabel{Q:multi-2}
  Second question.

:
  Answer to \QARef{Q:multi-1} and \QARef{Q:multi-2}.

"
  Now stop the multiple question mode, and start the **multiple answer** mode.

\DisableMultipleQuestion

\EnableMultipleAnswer

? \QALabel{Q:normal-multi}
  Question with two answers \QARef{A:multi-1} and \QARef{A:multi-2}.

: \QALabel{A:multi-1}
  First answer to \QARef{Q:normal-multi}.

: \QALabel{A:multi-2}
  Second answer to \QARef{Q:normal-multi}.

"
  Now start both the **multiple question** mode and the **multiple answer** mode.

\EnableMultipleQuestion

\EnableMultipleAnswer

? \QALabel{Q:multi-1'}
  Question.

? \QALabel{Q:multi-2'}
  Question.

:
  First answer to \QARef{Q:multi-1'} and \QARef{Q:multi-2'}.

:
  Second answer to \QARef{Q:multi-1'} and \QARef{Q:multi-2'}.

:
  Third answer to \QARef{Q:multi-1'} and \QARef{Q:multi-2'}.

"
  Back to the **normal** mode.

\DisableMultipleQuestion

\DisableMultipleAnswer

? \QALabel{Q:normal-1'}
  Question.

:
  Answer to \QARef{Q:normal-1'}.

? \QALabel{Q:normal-2'}
  Question.

:
  Answer \QARef{Q:normal-2'}.