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