$($cond

;; Check if course has no dependents and credit is $3$

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

$($courses$-$w$-$credits c $3)]$

;; Check if the course list has no dependents

$[($and $($list$?$ c$)$

$($null$?($course$-$dependents $($first c$))))$

$($map $($lambda $($course$)($courses$-$w$-$credits course $3))$ c$)]$

$[$else

$($filter$-$an$-$odd $($map $($course$-$number c$)($fn$-$for$-$loc c$)))]))]))$ ; actually the question ask course has no dependents AND course$-$number list has an odd and course$-$w$-$credits $>=3,$ so your suggested coding is not correct