%% Minimal compile test for arcs2.
\documentclass{article}
\usepackage{arcs2}
\begin{document}
Text default: \overarc{AB} \underarc{CD}
Text optional: \overarc[3]{ABC} \underarc[1]{x}
Cover n letters not whole word: \overarc{abcdef} vs \overarc[6]{abcdef} vs \overarc[2]{abcdef}
Wide: \wideoverarc{AB} \wideunderarc{YZ}
Math: $\overarc{PQ}+\underarc{RS}+\wideoverarc{TU}+\wideunderarc{VW}$
Bold: \textbf{\overarc{AB}\underarc{cd}\wideoverarc{ef}\wideunderarc{gh}}
Math bold: $\overarc{\mathbf{XY}}$
Color: \textcolor{red}{\overarc[4]{ABCD}} \textbf{\textcolor{red}{\overarc[4]{ABCD}}} \textcolor{blue}{\underarc[3]{xyz}}
\end{document}