As GotToBTru said, your code isn't very useful without sample data.

But if I have understood your problem well, there is one obvious solution. Uniqueness means hash: 

sub existsPair
{
  our %pairs;
  my (@pair) = sort @_;
  local $" = "~~"; # Only works as long as ~~ can't appear in one of t
+he inputs values
  return $pairs{"@pair"}++;
}

existsPair "Hello", "World"; # false
existsPair "Hello", "World"; # true
existsPair "World", "Hello"; # true
existsPair "He", "lloWorld"; # false

[download]
The hardest part of the job is to find a way to stringify the pair in a way that is actually unique, it can be by using an invalid character as a separator, or using pack for prepending the size of the first string, or whatever works.

In reply to Re: writing array as pairwise by Eily
in thread writing array as pairwise by AWallBuilder

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.