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	      Setzt Kenntnis von Aristoteles, Categoriae, und Boethius voraus. 
"a misleading title" [Southern (1966), 15]. 
"of all his works it is the most difficult to understand and therefore the easiest to misinterpret". [15]. 
"It is of all of his works the most difficult and least important." [Southern (1966), 204]. 	     |