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 | \documentclass[]{article}
 \usepackage[T1]{fontenc}
 
 \usepackage{lmodern}
 
 \usepackage{amssymb,amsmath}
 
 \usepackage{ifxetex,ifluatex}
 
 **\usepackage[body={18cm,24cm}]{geometry}**
 
 **\geometry{papersize={21cm,29.7cm}}**
 
 \usepackage{fixltx2e} % provides \textsubscript
 
 % use microtype if available
 
 \IfFileExists{microtype.sty}{\usepackage{microtype}}{}
 
 % use upquote if available, for straight quotes in verbatim environments
 
 
 |