This paper argues that adjuncts are introduced by asymmetric MERGE that
maps a workspace WS = [α, β] onto WS' = [{α, β}, α]. This proposal accounts
for the invisibility of adjuncts with respect to labeling, theta-relations,
extraction, and binding. If this proposal is on the right track,
Pair-Merge is eliminable, and adjunction is a consequence of MERGE, the
single operation attributed to UG.