Q$3.$ Consider the following program:

set$\_$dif$([],$Y$,$Y$).$

set$\_$dif$([$Y$|$R$],$X$,$Z$)$ :$-$

member$($X$,$Y$),$

set$\_$dif$($Y $,$X $,$Z$),!.$

set$\_$dif$([$X $|$R $],$Y $,[$X $|$Z $])$ :$-$

set$\_$dif$($Y $,$R $,$ Z$).$

What is the output of the following?

$?$ set$\_$dif$([2,4,6,8],[4,5,6,7,8],$L$).$