table associations issues

I am trying to get the table associations right for an application but
I am not sure how to make it happen with cakephp. I have a "students"
table that has a many to many relationship with the table groups. This
is straightforward to do but the problem is each group also has to
have a leader. The leader of each group is a student also. How do I
define the relevant models to make this setup work? This is what I
have so far.

<?php
class Group extends AppModel{
var $name = 'Group';
var $hasAndBelongsToMany = 'Student';
}
?>

<?php
class Student extends AppModel{
var $name = 'Student';
var $hasAndBelongsToMany = 'Group';
}
?>

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