First, one must understand why the ten sefirot of Ab are categorized as offspring of the first partzuf of Adam Kadmon. After all, the partzuf of Ab emerged from the fusion through collision that took place in the mouth of the head of the first partzuf, just as the ten sefirot of the body of the first partzuf itself also emerged from there. Why, then, is the partzuf of Ab removed from the category of the first partzuf so that is should be considered like a second partzuf and offspring of the first partzuf?