$(1$ point$)$

Read the following sequential program that and model one loop iteration by a

Data Flow Graph $($DFG$).$

double $a=.....,b=.....,c=.....,d=......$;

for $(..)\{$

double $s=a+b$;

double $t=a-b$;

$a=s$;

$b=t$;

$s=c*d+a$;

$t=\frac{c}{d}-b$;

$C=S$;

$d=t$;

$\}$