@SuppressWarnings("unchecked")
	@Override
	public boolean equals(Object obj)
	{
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Pair other = (Pair) obj;
		if (first == null)
		{
			if (other.first != null)
				return false;
		} else if (!first.equals(other.first))
			return false;
		if (second == null)
		{
			if (other.second != null)
				return false;
		} else if (!second.equals(other.second))
			return false;
		return true;
	}