$($define $($three$-$criteria$-$courses c$)$

$($cond

$[($empty$?$ c$)$ empty$]$

$[$else

$($local

$[($define $($fn$-$for$-$course c$)$

$($cons $($course$-$number c$)($fn$-$for$-$loc $($course$-$dependents c$))))$

$($define $($fn$-$for$-$loc loc$)$

$($cond

$[($empty$?$ loc$)$ empty$]$

$[$else

$($cons $($fn$-$for$-$course $($first loc$))($fn$-$for$-$loc $($rest loc$)))]))$

$($define $($filter$-$an$-$odd c$)$

$($filter $($lambda $($x$)($odd$?$ x$))$ c$))$

$($define $($extract$-$course$-$dependents courses$)$

$($map course$-$dependents courses$))$

$($define $($every predicate lst$)$

$($cond

$[($empty$?$ lst$)$ #t$]$

$[($predicate $($first lst$))($every predicate $($rest lst$))]$

$[$else #f$]))]$

$($cond

$[($and $($course$?$ c$)($equal$?$ LOC$0($course$-$dependents c$)))$

$($filter$-$an$-$odd $($courses$-$w$-$credits c $3))]$

$[($and $($list$?$ c$)($every $($lambda $($x$)($equal$?$ LOC$0($last $($course$-$dependents x$))))$ c$))$

$($all$-$course$-$numbers c$)]))])),$ output error expected: and$/$c list? not$/$c empty given:$\text{'}(),$ the main issue how to extract course$-$dependents from the list of course