 Contrary terms (enantia) come in two varieties (Cat. 11b38ff.). In immediate or logical contraries (odd/even, sick/well), a true middle—an entity satisfying the range of the two opposed terms but falling under neither of them—is excluded, e.g., an integer neither odd nor even. But mediate contrary pairs (black/white, good/bad) allow for a middle—a shade between black and white, a man or an act neither good nor bad. Neither mediate nor immediate contraries fall under the purview of the Law of Excluded Middle [LEM] (tertium non datur).