@Override
		public boolean equals(Object obj) {
			if (this == obj)
				return true;
			if (obj == null)
				return false;
			if (getClass() != obj.getClass())
				return false;
			Key other = (Key) obj;
			if (from == null) {
				if (other.from != null)
					return false;
			} else if (!from.equals(other.from))
				return false;
			if (to == null) {
				if (other.to != null)
					return false;
			} else if (!to.equals(other.to))
				return false;
			return true;
		}