A. We tend to see the similarity within a category as being more important, and the similarity between different categories as being less important, that either actually is.
B. Given a small amount of information about a person, we are ready to classify them as a member of a particular group, and then to infer all kinds of additional facts about them, as if all members of the group were the same in most respects.
C. Our tendency to classify and label everything can lead us into the error of seeing the world as made up of only those categories for which we have names.
D. Expecting too much of the descriptive power of languages is itself a serious cause of distorted thinking.