use strict;
use warnings;

use List::MoreUtils qw( uniq );

my %deck;

for my $suit (qw( Clubs Hearts Diamonds Spades )) {
    for my $rank (qw( 2 3 4 5 6 7 8 9 10 J Q K A )) {
        $deck{$suit}{$rank} = 1;
    }
}

$, = " ";
$\ = "\n";

# Prints 10 2 3 4 5 6 7 8 9 A J K Q
print sort { $a cmp $b } uniq map { keys $deck{$_} } keys %deck;