texmath-0.6.7: tests/writers/msubsup-04.tex
{{A}}_{{{C}}_{4}^{3}}^{{{B}}_{2}^{1}}={{A}}_{{{C}}_{{4}_{\phantom{\mathrm{l}}}}^{3}}^{{{B}}_{2}^{{1}^{\phantom{\mathrm{s}}}}}{{A}}_{{{C}}_{4}^{3}}^{{{B}}_{2}^{1}}={{A}}_{{{C}}_{{4}_{\phantom{\mathrm{l}}}}^{3}}^{{{B}}_{2}^{{1}^{\phantom{\mathrm{s}}}}}