C++ Homework Help Nested classes

Hi,

Alright 10 minutes into this thing and I am already stuck. I have a class Employee that seems fine, another class Student again fine.

Now I need a class TeachingAssistant nesting the first two classes. Sounds easy:
My header for just getting started:

#ifndef TEACHINGASSISTANT_H
#define TEACHINGASSISTANT_H

#include "Employee.h"
#include "Student.h"

class TeachingAssitant
{
public:
	TeachingAssitant();
	class Employee;
	class Student;
};

#endif

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When I go to implement TeachingAssistant it won't see it. I am including the above header file so I am not sure how to get further.

#include "stdafx.h"
#include "TeachingAssisstant.h"

using namespace std;

TeachingAssistant::TeachingAssistant() <- error

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Thanks!