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  1. or download this
    my $junk;
    print 1+$junk;
    
  2. or download this
    print 1+($junk ? $junk : 0);
    
  3. or download this
    $junk = 11;
    print 1+($junk ? $junk : 0);
    
  4. or download this
    $junk=0;
    print 1+($junk ? $junk : 15);