cards.tex

\documentclass[fontset=ubuntu, UTF8, a4paper]{ctexart}

\input{flashs.tex}

\begin{document}
    
    \page
         {\Huge }{\Huge \cgrave{e}}{}
         {\Huge }{\Huge \cacute{e}}{}
         {\Huge }{\Huge \ccheck{e}}{}
         {\Huge }{\Huge \covbar{e}}{}
         {\Huge }{\Huge \cgrave{a}}{}
         {\Huge }{\Huge \cacute{a}}{}
         {\Huge }{\Huge \ccheck{a}}{}
         {\Huge }{\Huge \covbar{a}}{}
         {\Huge }{\Huge \cgrave{u}}{}
         {\Huge }{\huge \cacute{u}}{}
         {\Huge }{\Huge \ccheck{u}}{}
         {\Huge }{\Huge \covbar{u}}{}
         {\Huge }{\Huge \cgrave{o}}{}
         {\Huge }{\Huge \cacute{o}}{}
         {\Huge }{\Huge \ccheck{o}}{}
         {\Huge }{\Huge \covbar{o}}{}

\end{document}