Found an old homework page: transliterating the colophon of the 1721 print of the Golden Beam Sutra (Mongolian Altan gerel) in Classical Mongolian script. The margins show the real puzzle: a/e, o/u, t/d, k/g share letter shapes, so vowel harmony and context decide. Good old times. 🧐 #Suvarṇaprabhāsa