public ItemSet GetUniqueItems() {
		ItemSet uniqueItems = new ItemSet();/*uniquely constructed itemSet*/
		for (int j = 0; j < transactionSet.size(); j++) {/*loop through the first transactionSet object*/
			for (int i = 0; i < transactionSet.get(j).getTransaction().getItemSet().size(); i++) {/*doubly loop through each respective itemset in a transactionSet*/
				Item item = transactionSet.get(j).getTransaction().getItemSet()
						.get(i);
				
				if (!uniqueItems.getItemSet().contains(item)) {/*Only add items if not already within the unique list. Otherwise do nothing.*/
					uniqueItems.getItemSet().add(item);
				}

			}
		}
		return uniqueItems;
	}