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\documentclass{article}
\usepackage{amssymb,amsmath}
\usepackage{iftex}
\ifXeTeX
\usepackage{fontspec,xltxtra,xunicode}
\defaultfontfeatures{Mapping=tex-text,Scale=MatchLowercase}
\else
\ifLuaTeX
\usepackage{fontspec}
\defaultfontfeatures{Mapping=tex-text,Scale=MatchLowercase}
\else
\usepackage[mathletters]{ucs}
\usepackage[utf8x]{inputenc}
\fi
\fi
\ifXeTeX
\usepackage[setpagesize=false, % page size defined by xetex
unicode=false, % unicode breaks when used with xetex
xetex]{hyperref}
\else
\usepackage[unicode=true]{hyperref}
\fi
\hypersetup{breaklinks=true, pdfborder={0 0 0}}
\setlength{\parindent}{0pt}
\setlength{\parskip}{6pt plus 2pt minus 1pt}
\setlength{\emergencystretch}{3em} % prevent overfull lines
\setcounter{secnumdepth}{0}
\begin{document}
\section{lhs test}
\texttt{unsplit} is an arrow that takes a pair of values and combines them to
return a single value:
\begin{verbatim}
unsplit :: (Arrow a) => (b -> c -> d) -> a (b, c) d
unsplit = arr . uncurry
-- arr (\op (x,y) -> x `op` y)
\end{verbatim}
\texttt{(***)} combines two arrows into a new arrow by running the two arrows
on a pair of values (one arrow on the first item of the pair and one arrow on
the second item of the pair).
\begin{verbatim}
f *** g = first f >>> second g
\end{verbatim}
Block quote:
\begin{quote}
foo bar
\end{quote}
\end{document}
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