public override int GetHashCode()
{
return this.xx.GetHashCode() ^ this.xy.GetHashCode() ^ this.xz.GetHashCode() ^ this.yx.GetHashCode() ^ this.yy.GetHashCode() ^ this.yz.GetHashCode() ^ this.zx.GetHashCode() ^ this.zy.GetHashCode() ^ this.zz.GetHashCode();
}