template class inside base class, include/use in dervied class - c++

Question

I have a template class called item.
I have another class having array of items - class hashTable.
I have third class which derived from hashTable - HSubject.
I'm confused about the using/include that I have to add to each class.
I tried many options but it produced run time errors.
code is attached here:
*item.h*
#pragma once
#include "stdafx.h"
#include <iostream>
#include <list>
#include <string>
#include <vector>
using namespace std;
enum state { empty, full, deleted };
template <class T, class K>
class item
{
// propeties and functions here
};
*hashTable.h*
#pragma once
#include <iostream>
#include <list>
#include <string>
#include <vector>
#include "item.h"
using namespace std;
// tried adding this but didn't seem to work
//template <class T, class K>
//class item<T, K>;
template <class T, class K>
class hashTable
{
public:
vector<item<T, K>> hashT;
hashTable();
// propeties and functions here
};
*hashTable.cpp*
#pragma once
#include "stdafx.h"
#include <iostream>
#include <list>
#include <string>
#include <vector>
#include <memory>
#include "hashTable.h"
using namespace std;
template<class T, class K>
hashTable<T, K>::hashTable()
{}
// functions are written here
*HSubject.h*
#pragma once
#include "stdafx.h"
#include <iostream>
#include <list>
#include <string>
#include <vector>
#include <memory>
class item<list<string>, string>;
using namespace std;
class HSubject :
public hashTable<list<string>, string>
{
public:
HSubject();
// propeties and functions here
};
*HSubject.cpp*
#pragma once
#include "stdafx.h"
#include <iostream>
#include <list>
#include <string>
#include <vector>
#include <memory>
#include "hashTable.h"
#include "HSubject.h"
#include "item.h"
using namespace std;
HSubject::HSubject() : hashTable()
{
}
// functions are written here
Any help would be greatful. Thanks!