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  1. or download this
    package SharedVariables;
    use base Exporter;
    ...
    );
    
    1;
    
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    package Foo;
    
    ...
    }
    
    1;
    
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    package Bar;
    
    ...
    
    
    1;
    
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    use SharedVariables qw(:DEFAULT);
    use Foo;
    ...
    Bar Scalar1 Bar
    Foo Scalar1 Main
    Bar Scalar1 Main