Here's a more general sort of solution. It's not particularly clean, but it works: 
#!/usr/bin/perl -w

use strict;

my @one = qw{C A T};
my @two = qw{D O G};
my @three = qw{B I R D};

my @combos = permute(\@one, \@two, \@three);
show_text(\@combos, \@one, \@two, \@three);

sub permute {
    my @arrays = @_;
    my @lengths;
    foreach my $array_ref (@arrays) {
        push @lengths, scalar @$array_ref;
    }
    return combine(@lengths);
}

sub combine {
    my $length = shift;
    my @results;
    for (0 .. ($length - 1)) {
        if (@_) {
            foreach my $result (combine(@_)) {
                push @results, $_ . $result;
            }
        } else {
            push @results, $_;
        }
    }
    return @results;
}

sub show_text {
    my ($combos, @arrays) = @_;
    foreach my $combo (@$combos) {
        my $i = 0;
        my $text = '';
        foreach my $elem (split'', $combo) {
            $text .= $arrays[$i++]->[$elem];
        }
        print "$text\n";
    }
}

[download]

In reply to Re: Sort of a permutation by chromatic
in thread Sort of a permutation by KM

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.