Given the following op code table and the assembly source code, complete the symbol table and convert the assembly code to the corresponding machine language code $($The length of each machine code is $2$ bytes$).($Assume that the program is loaded beginning with memory location $0.)$

$.$BEGIN

load x

add y

store z

out z

halt

x: $.$data $2$

y: $.$data $4$

z: $.$data $0$

$.$END

The symbol table

X

Y

z

After the program runs, what is the value stored in z$?$