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  1. or download this
    package Foo;
use strict;
our @ISA = 'Bar';
...
  2. or download this
    package Foo;
use strict;
use vars qw(ISA);
@ISA = 'Bar';
...
  3. or download this
    package Foo;
@ISA = 'Bar';
use strict;
...
  4. or download this
    package Foo;
use strict;
@Foo::ISA = 'Bar';
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  5. or download this
    package Foo;
use strict;
use base 'Bar';
...