@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		ItemSet other = (ItemSet) obj;
		if (items == null) {
			if (other.items != null)
				return false;
		} else {
			boolean itemsEgaux = true;
			for (Item i : items) {
				itemsEgaux &= other.getItems().contains(i);
			}
			if (!itemsEgaux)
				return false;
		}
		if (k != other.k)
			return false;
		if (support != other.support)
			return false;
		return true;
	}