@in = {                                 @out = {
        qw[M N],                                qw[C B A],
        qw[M N Q P O],                          qw[C G F E D],
        qw[C B A],                              qw[C G F H],
        qw[U S],                                qw[C G F H I],
        qw[V T],                                qw[C G F H J],
        qw[C G F E D],                          qw[M K],
        qw[C G F H],                            qw[M N],
        qw[C G F H I],                          qw[M N Q P O],
        qw[C G F H J],                          qw[U S],
        qw[M K],                                qw[V T],
};                                      };

[download]
Well, first off, that's no where near an array of arrays. You've got an array taking a single element which is a hashref pointing to an anonymous hash, constructed by taking alternating pairs of values, like: 
@in = ({
  M => 'N',
  M => 'N',
  Q => 'P',
  O => 'C',
  ...
});

[download]
So, if you started with that, you definitely need to figure out how to write your original problem first.

I could recommend perllol or perldsc as starting points.

-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.

In reply to •Re: Sort problem by merlyn
in thread Sort problem by BrowserUk

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.