Hello frank, so let's do this 10 letters = a, b, c, d and f g h i j
There are ten columns
Column a = 01, 11 21 31 41 51 61 71
So is doing the same was done on the 8 lines, but now
There are 10 columns
Aaab
......
Aajjj
Is to do as you did in the rows do in the columns
Objective = you cross the two patterns rows with columns
There are ten columns
Column a = 01, 11 21 31 41 51 61 71
So is doing the same was done on the 8 lines, but now
There are 10 columns
Aaab
......
Aajjj
Is to do as you did in the rows do in the columns
Objective = you cross the two patterns rows with columns