--- a/style.sty	Wed Jan 02 21:12:32 2019 +0000
+++ b/style.sty	Wed Jan 02 22:01:20 2019 +0000
@@ -21,28 +21,6 @@
 %%% for trees
 %% http://anorien.csc.warwick.ac.uk/mirrors/CTAN/graphics/pgf/contrib/forest/forest.pdf
 
-\newcommand\grid[1]{%
-\begin{tikzpicture}[baseline=(char.base)]
-  \path[use as bounding box]
-    (0,0) rectangle (1em,1em);
-  \draw[red!50, fill=red!20]
-    (0,0) rectangle (1em,1em);
-  \node[inner sep=1pt,anchor=base west]
-    (char) at (0em,\gridraiseamount) {#1};
-\end{tikzpicture}}
-\newcommand\gridraiseamount{0.12em}
-
-\makeatletter
-\newcommand\Grid[1]{%
-  \@tfor\z:=#1\do{\grid{\z}}}
-\makeatother	
-
-\newcommand\Vspace[1][.3em]{%
-  \mbox{\kern.06em\vrule height.3ex}%
-  \vbox{\hrule width#1}%
-  \hbox{\vrule height.3ex}}
-
-\def\VS{\Vspace[0.6em]}
 
 
 \newcommand{\dn}{\stackrel{\mbox{\scriptsize def}}{=}}
@@ -55,25 +33,19 @@
 \def\fnote{\gdef\@thefnmark{}\@footnotetext}
 \makeatother
 
-\newcommand{\HEADER}{{\bf Please submit your solutions via email. Please submit 
-only ASCII text or PDFs. Every solution should be preceeded by the corresponding 
-question text, like:
+% CW deadlines
+\def\cwSIX{15 November}
+\def\cwSIXa{20 December}
+
+\def\cwSEVEN{15 November}
+\def\cwSEVENa{20 December}
 
-\begin{center}
-\begin{tabular}{ll}
-Q$n$: & \ldots a difficult question from me\ldots\\
-A:    & \ldots an answer from you \ldots\\
-Q$n+1$ & \ldots another difficult question\ldots\\
-A:     & \ldots another brilliant answer from you\ldots
-\end{tabular}
-\end{center}
+\def\cwEIGHT{15 November}
+\def\cwEIGHTa{20 December}
 
-\noindent Solutions will only be accepted until 20th December! Please send only
-one homework per email.}\bigskip}
+\def\cwNINE{15 November}
+\def\cwNINEa{20 December}
 
-\newcommand{\POSTSCRIPT}{
-{\bf (Optional)} This question is for you to provide 
-regular feedback to me: for example
-what were the most interesting, least interesting, or confusing 
-parts in this lecture? Any problems with my Scala code? Please 
-feel free to share any other questions or concerns.} 
+\def\cwTEN{15 November}
+\def\cwTENa{20 December}
+