Consider the following code fragment:

$....$

$5\mathrm{.}8$ Exercises

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$....$

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Assume that $B$ is nested one level deeper that $A.$ To resolve the reference to

$x$ present in $B,$ why is it not enough to consider the activation record which

immediate precedes that of $B$ on the stack? Provide a counter$-$example filling the

spaces in the fragment with dots with appropriate code.