Diagram In My Book

While reading the section about contradictories in my book, I came across a diagram written by someone who had previously owned the textbook. The diagram was of a square, and on each corner, were the words: "all," "some," "no," and "some not," with lines connecting all of them together. At first, I knew it had to do with the concepts in the chapter, but I wasn't exactly sure how to relate it. Obviously, the past reader was pointing out the relationship between these words which indicate generalities in arguments, as each of the four words are commonly used in generalizing.

After seeing the diagram, I glanced back to where it is used in the text, on page 162. These words are all portrayed in claims, as well as in contradictories. These are used to show how generalities can be shown with different words, switching, for example, all, for not every, in an argument.

Going back to the diagram, I can see that the previous owner of my textbook was indicating how all four of the words stated earlier are interchangeable, and can be put in as both claims and contradictories alike. either that, or they drew a random square with an X through it out of boredom.