Coding 101 Exam - 6 03 2016 - 06. Stupid Password Generator

<?php
$n = intval(readline());
$l = intval(readline());
$password = "";
for ($i = 1; $i < $n; $i++) {
    for ($j = 1; $j < $n; $j++) {
        for ($k = ord('a'); $k < ord('a') + $l; $k++) {
            for ($m = ord('a'); $m < ord('a') + $l; $m++) {
                for ($p = max($i, $j); $p < $n; $p++) {
                    $password .= "$i" . "$j" . chr($k) . chr($m) . ("$p" + 1) . " ";
                }
            }
        }
    }
}
echo $password . "\n";