a) repeat-until command
Command ::= ... | repeat Command until Expression
b) conditional expression
Expression ::= ... | if Expression then Expression else Expression
Use your definition to prove the semantic equivalence of
m := if E1 then E2 else E3 and if E1 then m:=E2 else m:=E3.
c) expression with side effects
Expression ::= ... | begin Command return Expression end.
d) case command
Command ::= case IntegerExpr of (when Numeral+ => Command)+
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