cond
macro
(cond clause*)
clause := '( test-expr form* ')'
make-html > (let a 137)
it: a
make-html > (cond
((< a 100)
(print-line 'smaller-than-100))
((< a 200)
(print-line 'smaller-than-200))
(true
(print-line 'large)))
smaller-than-200