There are only a few good options for EKK. My first try gave some funny letter placements but the next one looked reasonable. Then I looked at RZK, which now had one letter filled. I wanted it to be the regular three-lettered indefinite article, but I found no other instances of RZ, which you would expect if my preferred fill was right. So I moved on to the plural form of the verb ‘to be.’ Then things fell into place.
Love it!
The conjunction after the comma was helpful, again.