public void headToHead(Attraction attr1, Attraction attr2) {
		if (attr1 != null) {
			//recommendation.addAttraction(attr1);
			for (String tag : attr1.getTags()){
				tags.add(tag);
			}
		}
		if (attr2 != null) {
			//recommendation.addAttraction(attr2);
			for (String tag : attr2.getTags()){
				tags.add(tag);
			}
		}
	}