Questions could be generated about meanings of answers and propositions because sometimes answers are vague and ambiguous. The meanings of expressions are often unclear or confusing. The meaning may be unclear because of the choice or misuse of words. Some people do not say what they mean or mean what they say. An answer may not answer enough. A solution may not sufficiently solve. Something that is deemed legal, or moral in one place may be immoral or illegal at some other place or time.