--- a/graphics.sty	Fri Jun 01 15:28:37 2018 +0100
+++ b/graphics.sty	Fri Jun 01 16:19:26 2018 +0100
@@ -10,7 +10,7 @@
 \usepackage{graphicx} 
 \usepackage{pgfplots}
 
-\pgfplotsset{compat=1.11}
+\pgfplotsset{compat=1.15}
 
 \newenvironment{bubble}[1][]{%
 \addtolength{\leftmargini}{4mm}%

Binary file handouts/ho01.pdf has changed

--- a/handouts/ho01.tex	Fri Jun 01 15:28:37 2018 +0100
+++ b/handouts/ho01.tex	Fri Jun 01 16:19:26 2018 +0100
@@ -28,7 +28,7 @@
 %% emacs regexes
 %% https://www.gnu.org/software/emacs/manual/html_node/elisp/Regular-Expressions.html
 
-%%  reasons for a new prgramming language
+%%  reasons for a new programming language
 %% http://beautifulracket.com
 
 % compiler explorer

Binary file handouts/ho02.pdf has changed

Binary file handouts/ho04.pdf has changed

--- a/handouts/ho04.tex	Fri Jun 01 15:28:37 2018 +0100
+++ b/handouts/ho04.tex	Fri Jun 01 16:19:26 2018 +0100
@@ -780,7 +780,7 @@
        (s, Semis)\;+ \\
        (p, (LParens + RParens))\;+\\ 
        (b, (Begin + End))\;+ \\
-       (w, WhiteSpacess)
+       (w, WhiteSpaces)
       \end{array}\right)^{\mbox{\LARGE{}*}}$
 \end{center}
 

Binary file handouts/notation.pdf has changed