Good morning! And blessings for the day!
Forgive an old anon brain
But I vaguely remember seeing those graphs like back in the 70s in CT school. Wracking my brain to force it to remember the code for that.
Do you remember way back in the 70s when they would print a code card with the alphabet. And over lays of cards with holes aligning to certain letters and could read a message from that.
Not sure if making myself clear or not. Old veteranfag here