The NSA Can't Pull That Off!

In 2001, somebody converted a small percentage of classified ads from the 50s into text for a cultural research project. A series of letters and a group of people all over the world communicating via classified ads. They used the word tennis 75 times. But it's weird. My program says it was encrypted. If it's encrypted, how do you know it's tennis? Well, encryption was different in 1952. It's a simple substitution cipher. The same cipher used in a bunch of old pre-ending my shit from Germany. And they were being deleted. Do you have any idea why? No, it's not my department. So could you forward that stuff to me? Well, do