static int a $=1$;

static int b $=2$;

static int c $=3$;

void main$($void$)\{$

printf$("$A B C$,$ x$=\%$d

$",$ a$)$;

fork$()$;

a$++$;

b$++$;

c$++$;

printf$("$A B$,$ y$=\%$d

$",$ b$)$;

fork$()$;

a$++$;

b$++$;

c$++$;

printf$("$A$,$ z$=\%$d

$",$ c$)$;

$\}$

In the output trace, the user could also observe $\text{'}$x$=$ Blank $6$ Question $1\text{'},\text{'}$y$=$ Blank $7$ Question $1\text{'}$ and $\text{'}$z$=$ Blank $8$ Question $1\text{'}.$