 The Dialectics explore aspects of “sameness” (tóng 同) and “difference” (yì 異) in several places. Fragments collected in the “Greater Selection” indicate that the writers were developing a detailed classification of types of “sameness,” and one canon (A88) appears to explore a contrast between relative and absolute sameness or difference. Textual problems make it impractical to discuss these passages here, but one pair of canons presents a clear, intelligible taxonomy of four types of sameness and difference (A86–87): 