He invented the conditional expression. (print (cond ((> a 10) "a is larger than 10") ((> a 20) "a is larger than 20") (t "a is

He invented the conditional expression. (print (cond ((> a 10) "a is larger than 10") ((> a 20) "a is larger than 20") (t "a is smaller than or equal to 10"))) COND takes zero or more conditional expressions and returns a value.