******** fig5.7 **********

	typedef struct list_node *node_ptr;

	struct list_node
	{
		element_type element;
		node_ptr next;
	};
	typedef node_ptr LIST;
	typedef node_ptr position;

	struct hash_tbl
	{
		unsigned int table_size;
		LIST *the_lists;    /* this will be an array of lists, allocated later */
	};				/* The lists will use headers, allocated later */
	typedef struct hash_tbl *HASH_TABLE;