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Testing runlatex.minrunlines=3; to avoid adding interaction to very small fragment examples.

one TeX line

\textbf{some text}
\textbf{nl some text}
\textbf{nl some text nl}

two TeX lines

\fbox{this}
\textbf{some text}
\fbox{this}    
\textbf{nl some text}
\fbox{this}    
\textbf{nl some text nl}

three TeX lines

  \textit{one}
  \textbf{some text}
  \textsf{three}
  \textit{one}
  \textbf{nl some text}
  \textsf{three}
  \textit{one}
  \textbf{nl some text nl}
  \textsf{three}