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+%% subtext.sty Look further down for brief description
+%%
+%% Copyright (C) 2019 Palle Jorgensen
+%%
+%% This program is free software: you can redistribute it and/or
+%% modify it under the terms of the GNU General Public License as
+%% published by the Free Software Foundation, either version 3 of the
+%% License, or (at your option) any later version.
+%%
+%% This program is distributed in the hope that it will be useful, but
+%% WITHOUT ANY WARRANTY; without even the implied warranty of
+%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+%% General Public License for more details.
+%%
+%% You should have received a copy of the GNU General Public License
+%% along with this program. If not, see
+%% <https://www.gnu.org/licenses/>.
+
+\ProvidesPackage{subtext}[2019/05/24 v. 1.0 LaTeX package for easy
+text-style subscripts in math mode.]
+
+\RequirePackage{amstext}
+
+\let\saved@sub_
+\catcode`_\active
+\def\new@sub@text[#1]{\saved@sub{\text{#1}}}
+\def\new@sub@other#1{\saved@sub{#1}}
+
+\def\new@sub{%
+ \@ifnextchar[%]
+ {\new@sub@text}{\new@sub@other}}
+\def_{\new@sub}
+
+\endinput \ No newline at end of file