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  1. or download this
    my %month_hash = (
    '1' => 'January',
...
    '3' => 'March',
    '4' => 'April'
);
  2. or download this
    my @order = (1 .. 4);
  3. or download this
    my @months = @month_hash{@order};
print $_,$/ for @months;
  4. or download this
    delete $month_hash{3};
my @months = @month_hash{@order};
print $_,$/ for @months;