diff -r 7a5ad01a85b5 -r 5616b45d656f cws/main_cw04.tex
--- a/cws/main_cw04.tex	Sat Nov 28 15:58:36 2020 +0000
+++ b/cws/main_cw04.tex	Mon Nov 30 00:06:15 2020 +0000
@@ -6,6 +6,7 @@
 \usepackage{../style}
 \usepackage{../langs}
 \usepackage{disclaimer}
+\usepackage{ulem}
 
 \begin{document}
 
@@ -29,7 +30,7 @@
 This part is about searching and backtracking. You are asked to
 implement Scala programs that solve various versions of the
 \textit{Knight's Tour Problem} on a chessboard. The preliminary part (4\%) is
-due on  \cwNINE{} at 5pm; the core part (6\%) is due on \cwNINEa{} at 5pm.
+due on  \sout{\cwNINE{}} \textcolor{red}{16 December} at 5pm; the core part (6\%) is due on \cwNINEa{} at 5pm.
 Any 1\% you achieve in the preliminary part counts as your ``weekly engagement''.
 \bigskip 
 %Note the core, more advanced, part might include material you have not