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  1. or download this
        $VAR = "old VAR";
    sub func {return ("old func()")}
...
    show();
    redefine();
    show();
  2. or download this
        VAR='old VAR', func()='old func()'
    VAR='new VAR', func()='new func()'
    VAR='old VAR', func()='new func()'
  3. or download this
     
    $VAR = "old VAR";
    $FUNC = sub {return ("old func()")};
...
    show();
    redefine();
    show();
  4. or download this
        VAR='old VAR', func()='old func()'
    VAR='new VAR', func()='new func()'
    VAR='old VAR', func()='old func()'