diff -r ddcb616e036a -r aaf0bd0a211d style.sty
--- a/style.sty	Thu Oct 29 00:25:20 2020 +0000
+++ b/style.sty	Fri Oct 30 01:45:03 2020 +0000
@@ -5,7 +5,7 @@
 \setmainfont[Ligatures=TeX]{Palatino Linotype}
 \usepackage{amssymb}
 \usepackage{amsmath}
-\usepackage{menukeys}
+%\usepackage{menukeys}
 \definecolor{darkblue}{rgb}{0,0,0.6}
 \usepackage[colorlinks=true,urlcolor=darkblue,linkcolor=darkblue]{hyperref}
 \usepackage{soul}
@@ -24,31 +24,7 @@
 \newcommand{\inj}{\textit{inj}}
 \newcommand{\nullable}{\textit{nullable}}
 
-%%% 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]}
 
 
 %%% url pointers