We report a structural analysis of three administrative writing systems operating simultaneously within the same institutional context at Susa (c. 2600–1900 BCE): Proto-Cuneiform (language Sumerian, fully deciphered), Proto-Elamite (language unknown, the most important unsolved problem in early writing), and the Indus closed-string system (language Proto-Dravidian, established independently in Molina 2026d–e). Principal findings: All three systems share a positionally-locked opener-body-closer administrative grammar confirmed at seven independent structural levels. Structural compatibility across all three systems is consistent with the McAlpin Proto-Elamo-Dravidian typological hypothesis (McAlpin 1981). The presence of documented Meluhhan translators (eme-bal) at Susa establishes a human institutional interface between Proto-Dravidian and Sumerian at the precise administrative center where Proto-Elamite was also operating. The typological alignment between Dravidian and Elamite — both agglutinative, SOV, with similar case logic — provides a structural explanation for the five-century institutional durability of the tripartite interface. The structural compatibility argument does not constitute a decipherment of Proto-Elamite. It constrains the set of possible spoken languages consistent with the observed institutional grammar and provides the strongest independent structural corroboration McAlpin's hypothesis has received, arriving from a completely independent methodological direction. McAlpin (20 February 1945 – 23 December 2023) did not survive to see this corroboration. This deposit stands on two prior deposits as established inputs: the Proto-Elamite / Proto-Cuneiform bilingual structural analysis (Molina 2026c) and the Proto-Dravidian identification of the Harappan spoken language (Molina 2026e). Full analytical methodology withheld pending peer-reviewed publication. SHA-256 hash of the full technical record embedded for priority verification.
Juan Gabriel Molina (Mon,) studied this question.