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  1. or download this
    package ClassA;
    
    ...
    }
    
    1;
    
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    package ClassB;
    
    ...
      $self->{c} = ClassC->new();
    }
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    package ClassC;
    
    ...
      $self->{b} = ClassB->new();
    }
    1;
    
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    #!/usr/bin/perl -l
    # Test program
    ...
    
    $c->{model} = 't';
    print $c->{model};