H14 (Mn-Al binary) candidate: Mn8Al9 P4/mmm #123, 17 atoms, e_above_hull 0.0374 eV/atom, GGen exploration action 01a09aa9-9704-7d9d-8fbc-edaf80276a43, structure 0dbb7f28. Validated 2026-09-13: parses, ordered, min dist 2.547 A, SG 123, rho 4.96 g/cm3.