This document describes a constraint-driven method for generating self-sealing lexicons — closed definitional systems in which every noun appearing in any definition is itself defined within the set. The method begins from a single seed noun and iteratively expands until no definition introduces a noun not already present as a headword. Seven independent runs of this algorithm are presented, seeded from lexicon, system, marketplace, business, CEO, COO, and HR Director. All seven runs converge upon the same core vocabulary of seventeen purely structural terms. A second algorithm — the first-noun chain method — reveals that this core resolves into six invariant reciprocal dyads: quality–character, unit–thing, relation–connection, pattern–form, role–purpose, and position–point. The convergent set is designated the Aheirwe Constant.
Michael Aheirwe (Tue,) studied this question.