<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\begin{sequencediagram}
  \newthread{a}{:A}
  \newinst{b}{:B}
  \newinst[1]{c}{:C}
  \newinst[2]{d}{:D}
\end{sequencediagram}</pre></body></html>