$($Write out the evolution of the function call given the following function:

$($defun f$1($xy$)($if $($null x$)\text{'}()($cons $($cons $\{$:$+y(car(carx)))(cons(+y(car(cdr(carx))){)}^{\text{'}}(()))(f1(cdrx)y)$

$($setq nl$1\text{'}((12)(34)(56)(78)))$

$($f$1$ nl$12)$

Write a function that will add every number together that is not equal to $1$ in a single list.