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  1. or download this
    perl -wMstrict -E 'my $x = defined $ARGV[5]; say defined $x'
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  2. or download this
    my $x = defined $x || defined $y;
  3. or download this
    die "blah...\n" if ! $x;
  4. or download this
    die "blech...\n" if ! defined $x || defined $y;