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Of problems some are universal, others particular. Universal problems are such as "Every pleasure is good" and "No pleasure is good"; particular problems are such as "Some pleasure is good" and "Some pleasure is not good". The methods of establishing and overthrowing a view universally are common to both kinds of problems; for when we have shown that a predicate belongs in every case, we shall also have shown that it belongs in some cases. Likewise, also, if we show that it does not belong in any case, we shall also have shown that it does not belong in every case. First, then, we must speak of the methods of overthrowing a view universally, because such are common to both universal and particular problems, and because people more usually introduce theses asserting a predicate than denying it, while those who argue with them overthrow it. The conversion of an appropriate name which is drawn from the element "accident" is an extremely precarious thing; for in the case of accidents and in no other it is possible for something to be true conditionally and not universally. Names drawn from the elements "definition" and "property" and "genus" are bound to be convertible; e.g. if "to be an animal that walks on two feet is an attribute of S", then it will be true by conversion to say that "S is an animal that walks on two feet". Likewise, also, if drawn from the genus; for if "to be an animal is an attribute of S", then "S is an animal". The same is true also in the case of a property; for if "to be capable of learning grammar is an attribute of S", then "S will be capable of learning grammar". For none of these attributes can possibly belong or not belong in part; they must either belong or not belong absolutely. In the case of accidents, on the other hand, there is nothing to prevent an attribute (e.g. whiteness or justice) belonging in part, so that it is not enough to show that whiteness or justice is an attribute of a man in order to show that he is white or just; for it is open to dispute it and say that he is white or just in part only. Conversion, then, is not a necessary process in the case of accidents.
We must also define the errors that occur in problems. They are of two kinds, caused either by false statement or by transgression of the established diction. For those who make false statements, and say that an attribute belongs to thing which does not belong to it, commit error; and those who call objects by the names of other objects (e.g. calling a planetree a "man") transgress the established terminology.