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  1. or download this
    package Foo;
    sub new { ... };
    sub xyzzy { ... };
    1;
    
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    require Foo;
    my $foo = new Foo ( );
    print $foo->xyzzy ( );
    
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    # The new Foo.
    package Foo;
    ...
    @ISA = qw ( System::Foo );
    ...
    1;
    
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    package System::Foo;
    ...