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I'm stitching 4 research papers using the book class. The first two papers are closely related, so I would like the chapter labelling to be as following:

  • Chapter 1a
  • Chapter 1b
  • Chapter 2
  • Chapter 3

Is there a way to achieve this mixed numbering with some LaTeX variant?

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By redefining \thechapter and altering the value of counter chapter, the following example works, though not very elegant.

\documentclass{book}

\begin{document}
\tableofcontents

\renewcommand{\thechapter}{1\alph{chapter}}
\chapter{title}

\chapter{title}

\setcounter{chapter}{1}
\renewcommand{\thechapter}{\arabic{chapter}}
\chapter{title}

\chapter{title}
\end{document}

enter image description here

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