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  1. or download this
        package A;                 
        sub foo { print "called A::foo\n"; shift->NEXT::UNSEEN::foo() }
    ...
    package ::;
    
    E->foo();
    
  2. or download this
    #!/usr/local/bin/perl
    use NEXT;
    ...
    package ::;
    
    GRANDCHILD->traverse();