here&#x27;s a good overview by Dr J Allen Hynenk with a better reproduction ~ <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=Kn4strYhWok" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=Kn4strYhWok</a>