chi/reference-manual/rail_diagrams/choice_statement.tex

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\begin{rail}
ChoiceStatement : IFKW BooleanExpression COLONTK ( Statement + SEMICOLTK ) \\
                  ( ()
                  | ( ELIFKW BooleanExpression COLONTK ( Statement + SEMICOLTK ) ) + ()
                  ) \\
                  ( ()
                  | ( ELSEKW COLONTK ( Statement + SEMICOLTK ) )
                  )
                  ENDKW ;
\end{rail}