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A comprehensive model has been elaborated which determines sameness, equivalence and diversity relations. Sameness is the relation in which only one entity stands opposite to itself, in which there is a quantitative and qualitative identity. a = a is the same (Felix the cat is Felix the cat), but a = b is the same as well if a = c and b = c (Ljubo Babic is Ksaver Sandor Gjalski). Equivalence is the...