I'm glad I'm not the only one whose confused. You both put it really well about all the variations and the learning curve and those links...I will look at them when I detox from all the info already inside my head. lol. I feel punch drunk and no I dont drink.
It certainly is an adventure one that I would guess never ends. I mean at what point does the learning end? Probably never.

This piece should be like given to some gemstone learning hospital or something like they do with cadavers that have some strange disease. It could be used as a teaching tool for years and I wonder who or when, if anyone, would ever figure it out. TASART you certainly seem to have the most encyclopedic knowledge. I award you the cadaver just for that alone. lol. Only kidding. How I wish that I could. ALL of you are really impressive.
Going to defrag my brain then I will look at those links.