Consider the following program:

procedure Main is A$,$ B$,$ C: Integer; procedure Sub$1$ is A$,$ D$,$ E : Integer; begin

end; $-$ Sub$1$ procedure Sub$2$ is B$,$ D$,$ G: Integer; procedure Sub$3$ is A$,$ F: Integer; begin

end; Sub$3$

begin

end;

$-$ Sub$2$

begin

end; Main

List all the variables, along with the subprograms where they are declared, that are visible in the bodies of Sub$1,$ Sub$2,$ Sub$3$ and Main, assuming static scoping is used.