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  1. or download this
    if ($main::stateIn{'sibling'}) {
        no strict 'refs';
        &{$main::stateIn{'sibling'}}();
    }
    
  2. or download this
    #!C:/perl/bin/perl.exe -w
    use strict;
    ...
    
    close INV;
    close OUT;
    
  3. or download this
    SWITCH: {
        if ( defined $sibling ) {
    ...
            &main;
            last SWITCH;
        }