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[285b] he must not give up until he sees all the differences in them, so far as they exist in classes; and conversely, when all sorts of dissimilarities are seen in a large number of objects he must find it impossible to be discouraged or to stop until has gathered into one circle of similarity all the things which are related to each other and has included them in some sort of class on the basis of their essential nature. No more need be said, then, about this or about deficiency and excess; let us only bear carefully in mind that two kinds of measurement which apply to them have been found,


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