H14 (Mn-Al binary) candidate: Mn3Al4 P4/mbm #127, 14 atoms, e_above_hull 0.0323 eV/atom, GGen exploration action 01a09aa9-9704-7d9d-8fbc-edaf80276a43, structure d26e3cf9. Validated 2026-09-13: parses, ordered, min dist 2.545 A, SG 127, rho 4.53 g/cm3.