v0.1-RC1/chi/reference-manual/rail_diagrams/select_alternative.tex

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\begin{rail}
SelectAlternative :( [1] ( ( () | ( BooleanExpression COMMATK ) )
                           ( SendStatement | ReceiveStatement )
                         )
                   | [2] BooleanExpression
                   )
                   ( () | ( [3] COLONTK ( Statement + SEMICOLTK ) ) )
                  ;
\end{rail}