Q$2(40$ points$)$ Consider four threads running on a multicore processor. Assume that before this code is run, both x and y are initialized to $0.$

Thread $1$: x $=7$;

Thread $2$: y $=4$;

Thread $3$: w $=$ x $+$ y $+3$;

Thread $4$: z $=$ x $+$ y $-4$;

$($a$)[30$ points$]$ What are all the possible resulting values of w$,$ x$,$ y$,$ and z$?$ For each possible outcome, explain how we might arrive at those values. You will need to examine all possible interleaving$$s of instructions.