texmath-0.9.4: tests/writers/mfrac-09.eqn
9 over 14 = 9 over 14 {hphantom {{hphantom 1} over {hphantom 2}}} over {hphantom {{hphantom 1} over {hphantom 2}}}
9 over 14 = 9 over 14 {hphantom {{hphantom 1} over {hphantom 2}}} over {hphantom {{hphantom 1} over {hphantom 2}}}