@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((v1 == null) ? 0 : v1.hashCode());
		result = prime * result + ((v2 == null) ? 0 : v2.hashCode());
		result = prime * result + ((v3 == null) ? 0 : v3.hashCode());
		return result;
	}