Thus when Keter, for example, was selected and cleansed, it left a certain aspect of itself behind, for it no longer sustained the evil that had come from it with the exception of some aspect that still remained inasmuch as the perfection was still not revealed completely. However, this is not considered an aspect of Keter but rather an aspect of Chochmah, which had not yet been cleansed, and which still contained something that produced evil.
And this is where the root of evil that had been in Keter went. Thus even the evil rejected from Keter was now being sustained through Chochmah, which came after it. Chochmah was then similarly cleansed, and the evil was rejected from it, yet the evil was still sustained, this time through Binah, which came after Chochmah. This included sustaining the evil that came from Keter as well as the evil that came from Chochmah.