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  1. or download this
    use warnings;
use strict;
...
__DATA__
hello
world
  2. or download this
    ("A", [10, 20], [30, 40])
("B", [10, 20], [30, 40])
...
("B", undef, [30, 40])
("D", undef, undef)
("E", undef, undef)