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  1. or download this
    package Hello;

...
}

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  2. or download this
    package Greeting;

...

__PACKAGE__->meta->make_immutable;
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    package Greeting2;

...

__PACKAGE__->meta->make_immutable;
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    package Greeting3;

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__PACKAGE__->meta->make_immutable;
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    Greeting=HASH(0x2b411f8)        does Hello
hello world
...

Greeting3=HASH(0x15c01f8)       does Hello
hello world