Hi nice People !!!

In my research on the Z340, I noticed that there are two columns that do not have the "letters mirrored", since it is considered the symbol that resembles the number 9 a P. Where are the columns 9 (center) and the column 14. Also I noticed that there is an "accumulation" mirrored letters between 1 and 8 columns (31) and a lower number of mirrored letters in columns 10 to 17 (23).
Only sharing, and possibly these things have already been observed Please disregard.
Marcelo

ps: this was done in a rudimentary way, possible errors.