In order to study the logical relationships of categorical statements you must keep their meaning clearly in mind. The two universal forms, A Form and E Form, are easy to prove false but tough to prove true. The two particular forms, I Form and O Form, are easy to prove true but tough to prove false.
In ordinary conversation people make categorical claims frequently, but they do not always use the standardized language of "All" and "No." In addition it is important to recognize that people often express beliefs about categories that fall somewhere in the middle between our very strict universals 100% or 0% and our very loose particulars <100% or >0% For example someone may say "The majority of Americans..." meaning >50% or "Very few Americans..." meaning <10%.
Claims about "most" people are not subject to counterexamples the way that strict categorical statements are. For example, if someone makes the claim that "Most Americans are opposed to censorship" bear in mind that you cannot prove this to be false by finding one American who likes censorship. Only strict universal statements are subject to counterexamples.
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