you know- i think this resonates with me as well.... confusing as all get out.... but the more i learn, the more things emerge. I now have a part that seems younger than some of the others but has better handwriting and drawing than any of us at any age. I've lost count now as to how many, who's who and what their functions are. But if some have sub-sets, then that makes sense. There were 13 the last time I tried to do a mapping - that was before this new part emerged with a totally different way of relating.