Binary file cws/cw02.pdf has changed

--- a/cws/cw02.tex	Tue Oct 19 12:13:13 2021 +0100
+++ b/cws/cw02.tex	Tue Oct 19 22:49:14 2021 +0100
@@ -82,7 +82,7 @@
 \item parentheses are \texttt{(}, \texttt{\{}, \texttt{)} and \texttt{\}}
 \item there are semicolons \texttt{;}
 \item whitespaces are either \texttt{" "} (one or more) or \texttt{$\backslash$n} or
-  \texttt{$\backslash$t}
+  \texttt{$\backslash$t} or \texttt{$\backslash$r}
 \item identifiers are letters followed by underscores \texttt{\_\!\_}, letters
 or digits
 \item numbers are \pcode{0}, \pcode{1}, \ldots and so on; give