Variables and conditions.
VAR(VAR1, ... , VAR N) - Creates variables VAR1, ... VAR N if they don't exist.
VarName := Value - Assigns Value to variable VarName, for example \a:=4\
SET(VarName, Value) - Assigns Value to variable VarName.
IIF(Logical_expr, Value1, Value2) - Returns one of two values depending on the value of a logical expression. This function, also known as Immediate IF, evaluates a logical expression and then returns one of two expressions. If the logical expression evaluates to True, IIF( ) returns the first expression. If the logical expression evaluates to False, IIF( ) returns the second expression.
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