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print $$f;
{
...
  print $$g;
}
print $$f;

print $$f;
switch on the strict refs flag;
...
print $$g;
switch off the strict refs flag;
print $$f;

print ( dereference $f allowing strings );
print ( dereference $f not allowing strings );
print ( dereference $g not allowing strings );
print ( dereference $f allowing strings );

use MyModule; # this will be run once at compile time
print "hello\n";
...
  use MyModule; # this will be run once at compile time
  print $_;
}