a subtype of parallel contrast in which the two propositions are identical except for the contrasting parts, and the contrasting parts are construed as belonging in a set relationship -- that is, they are members of a poset. Example: in He brought back all the goods, and he also brought back his kinsman Lot and his goods, the second clause is identical except for the members of the poset {all the goods, his kinsman Lot and his goods}. (Section 11.4.1)