When asking this question, I used three following sentences:
In this manual I've met a sentence:
During my classes, I was told that the double usage of the in structures like A of B is prohibited.
Also, I've read a manual about the usage of articles, but I don't remember any information regarding this issue.
Are punctuation and articles in these sentences correct?
(I want to know whether my basics are right. Preparing for GRE)