Just for argument , let’s say that’s right then you might get;
BNYPVTT-MZFP-KWG
ZQSVMTQ-YOWU-XPN
BERLIN-KLOCK-IMU
I completed the group of 7 and finished it with missing letters so that if you alphabetize the middle line you get
MNOPQQSTUVWXYZ
Which is more like what you’d expect to see (?)