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my $x = 1;
my $b = 'A';
...

my @more = ('A'..'AZ');
  # @more now contains A, B, .. Z, AA, AB, ..AZ.

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my $b = 'Z';
$b--; # You don't get Y.
...
my @array = (10..1); # You don't get 10, 9..1.

my @letters = ('Z'..'A'); # You don't get the letters reversed.