eyepopslikeamosquito's planetscape and me: 1282 nodes apiece can be queried, or turned into a Greasemonkey script to run each time Saints in our Book loads:

// ==UserScript==
// @name PerlMonks Saints in our Book Ties
// @namespace http://www.example.com/chacham/
// @description Find ties in Saints in our Book, based on Writeups and
+ Experience
// @include http://perlmonks.org/?node_id=3559
// @grant none
// ==/UserScript==
var table = document.getElementsByTagName('table')[4];

for (var i = 1; i < table.rows.length; i++)
 if    (
        (table.rows[i].cells[2].textContent == table.rows[i + 1].cells
+[2].textContent)
     &&    (table.rows[i].cells[4].textContent == table.rows[i + 1].ce
+lls[4].textContent)
    )
 alert(table.rows[i].cells[0].textContent + ' ' + table.rows[i].cells[
+1].textContent + '\r\n'
        + table.rows[i + 1].cells[0].textContent + ' ' + table.rows[i 
++ 1].cells[1].textContent);
[download]

Alternatively, it can be turned into a bookmarklet by enclosing it in javascript:(function(){})();, to execute on demand. That is, copy and paste the following as a new bookmark:

javascript:(function(){var table = document.getElementsByTagName('tabl
+e')[4];

for (var i = 1; i < table.rows.length; i++)
 if    (
        (table.rows[i].cells[2].textContent == table.rows[i + 1].cells
+[2].textContent)
     &&    (table.rows[i].cells[4].textContent == table.rows[i + 1].ce
+lls[4].textContent)
    )
 alert(table.rows[i].cells[0].textContent + ' ' + table.rows[i].cells[
+1].textContent + '\r\n'
        + table.rows[i + 1].cells[0].textContent + ' ' + table.rows[i 
++ 1].cells[1].textContent);})();
[download]

To test it, as it stands at the time this is being posted, it should alert you to one set of duplicates.

Added on OpenUsersJS at PerlMonks Saints in our Book Ties