procedure : real$)$

$x$ : real

procedure : real$)$

$y$ : real

procedure : real$)$

$z$ : real

$...----(*)$

$...$

Assuming static scope, what is the referencing environment marked by

${(}^{**})?$

procedure : real$)$

$x$ : real

procedure : real$)$

$y$ : real

procedure : real$)$

$z$ : real

$...,----{(}^{**})$

$...$

$...$

Assuming static scope, what is the referencing environment marked by

${(}^{**})?$