What does the following Scheme function do$?$ bed at blank $2010\mathrm{.}10\mathrm{.}11$ blem Set $($define $($xlis$)($cond $(($null$?$ lis$)0)($not $($list $($car lis$)($cond $($leg$?($car lis$)+$E$)$ X rear lis$)))($else $(+1$ x $($cdr $118)))))($else $(+($x car lis$))($x $($ede lis $))))$ Describe briefly what this function does. For the following two function calls: $($x $\text{'}($#f #f #t$)),($x $\text{'}(($#t #f$)($#t #t$))),$ what would each call return?