H14 (Mn-Al binary) candidate: Mn3Al2 I4/mmm #139, 5 atoms, e_above_hull 0.0175 eV/atom, GGen exploration action 01a09aa9-9704-7d9d-8fbc-edaf80276a43, structure 42170895. Validated 2026-09-13: parses, ordered, min dist 2.357 A, SG 139, rho 5.93 g/cm3.