Pro-Con, Thesis-Antithesis, Meme-Contra

from Borges’ Tlön, Uqbar, Orbis Tertius

Their books are also different. Works of fiction contain a single plot, with all its imaginable permutations. Those of a philosophical nature invariably include both the thesis & antithesis, the rigorous pro & con of a doctrine. A book which does not contain its counterbook is considered incomplete.