Part 16 · Chapter 227

Also its explanation is that the screen made between Beriah and Yetzirah is that the Bina of Atzilut became clothed within ZA of Beriah, and through her that screen was made. And if so, it is found that all of Yetzirah is from the six Sefirot, which are ZA. But the difference of Ima and ZON of Yetzirah is that the VAK of Ima has no Makif at all, and the VAK of ZA has one Makif, and the Nukva, which also has VAK, has two Makifim.