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Machine-readable Mn-Bi phase and prototype-neighborhood map for H12 (quest 01a095ec item order 10). Joins the cited Mn-Bi literature baseline (dataset 01a096ca-d30b-708b-b45f-886a26397e3a) to every checked H12 structure: the D019 Mn3Bi anchor (the only checked structure) plus the program control LTP MnBi, and records the five out-of-window GGen near-hull phases as unevaluated context. Measures: prototype match = space group + reduced stoichiometry + Wyckoff-set identity to a named prototype; composition distance = L1 norm on elemental fractions to the nearest reported Mn-Bi phase; lattice descriptors (c/a, volume per atom, minimum pair distances) computed with pymatgen from the CIFs at symprec 0.1. cif_file_id holds file asset ids (promoted to a reference column after ingest). Synthesis-plausibility labels carry their evidence; readers are invited to challenge the prototype and synthesis labels.