Racket cond

A collection of question-answer pairs of expressions

<expr> ::= (cond {<expr> <expr>} [(else <expr>)])

Can be interpreted as:

(cond 
	[(cond0) expr0]
	[(cond1) expr1]
	   ...
	[(condn) exprn]
	[else expr]
	)

• Evaluate cond0, if result is not #f ,evaluate expr0
• Otherwise, evaluate cond1, if result is not #f, …