diff --git a/Lectures/L28_ParnasTables/ParnasTables.pdf b/Lectures/L28_ParnasTables/ParnasTables.pdf
index a5cd6f409ea9546fa171e3c809b202fd9d21cfb0..00c7dd4746a809e42bcd622ed7fa04eabb13a888 100644
Binary files a/Lectures/L28_ParnasTables/ParnasTables.pdf and b/Lectures/L28_ParnasTables/ParnasTables.pdf differ
diff --git a/Lectures/L28_ParnasTables/ParnasTables.tex b/Lectures/L28_ParnasTables/ParnasTables.tex
index cb9fffd6df21937ee67b9f83542b0d8cd7241095..fa605cdfc22b22184aeb029aeb27be0cf11831ad 100755
--- a/Lectures/L28_ParnasTables/ParnasTables.tex
+++ b/Lectures/L28_ParnasTables/ParnasTables.tex
@@ -29,7 +29,7 @@
\mode<presentation>{}
\input{../def-beamer}
-\Drafttrue
+\Draftfalse
\newcommand{\topicTitle}{28 Parnas Tables}
\ifDraft
@@ -54,7 +54,7 @@
\begin{itemize}
\item Today's slide are partially based on slides by Dr.\ Wassyng
\item Administrative details
-\item Translating English to Math exercise
+\item Design patterns
\item Motivating example: midterm question
\item History of tables
\item Example tables
@@ -78,16 +78,17 @@ TBD
{
\begin{itemize}
-\item A3 deadlines
+\item A3
\begin{itemize}
-\item Part 2 - Code: due 11:59 pm Mar 20
-\item \structure{Part 1 spec available in repo}
+\item Part 1 - Solution: Mar 18
+\item Part 2 - Code: due 11:59 pm Mar 26
\end{itemize}
\item A4
\bi
\item Your own design and specification
-\item Due April 3 at 11:59 pm
+\item Model module for game of Freecell
+\item Due April 9 at 11:59 pm
\ei
\end{itemize}
@@ -99,178 +100,75 @@ TBD
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
-\frametitle{Exercise}
-
-\bi
-\item
- \href{http://www.lonelyplanet.com/blog/2011/11/24/lost-in-translation-our-top-20-photos/}{For
- SE Section}
-\ei
-
-Consider an array $D$ with index values ranging from $1$ to $n$. The subject of this example is part of a specification
-for a subprogram that will count how many times a particular given value occurs in the array $D$.\\
-~\newline
-
-The goal of this exercise is to write a postcondition for the subprogram, relating the various relevant variablesÕ
-values when the search is complete.
-
-\end{frame}
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\begin{frame}
-\frametitle{Exercise Continued}
-
-Understand the task in the original language
-
-\begin{itemize}
-
-\item Identify objects referred to (look for nouns in the original English text)
-\item<2-> \structure<2>{Array $D$, index value, times (count), particular given value, relevant variables's value}
-\item Identify missing information
-\item<3-> \structure<3>{Names of variable for: index, times (count), particular given value}
-\item<4-> \structure<4>{Are there any other relevant variables?}
-\end{itemize}
-
-\end{frame}
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\begin{frame}
-\frametitle{Exercise}
-
-\begin{itemize}
-
-\item Identify missing information
-\item Names of variable for
-\begin{itemize}
-\item Index: assume $i$
-\item Times (count): ask the author of the task, assume $\mathit{count}$
-\item Particular given value: Ask the author of the task, assume $\mathit{key}$
-\item Are there any other relevant variables? (no?)
-\end{itemize}
-\end{itemize}
-
-\end{frame}
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\begin{frame}
-\frametitle{Exercise Continued}
-
-\begin{itemize}
-\item Close the gap between English text and mathematics
-\begin{itemize}
-\item Reword the English text to be closer to mathematics
-\item Use the English verb $\mathit{count}$
-\end{itemize}
-
-\end{itemize}
-
-\end{frame}
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\begin{frame}
-\frametitle{Exercise Continued}
+\frametitle{Command Processor Pattern}
\begin{itemize}
-\item The English verb $count$ means, in programming language and in terms closer to mathematics, $\mathit{add}$ $1$
-\item But this is a dynamic (action) concept
-\item The corresponding static (state, relational) concept in mathematics is the function \textit{addition with 1},
-that is $+1$
+\item Context: User interfaces which must be flexible or provide functionality that goes beyond the direct handling of
+user functions. Examples are undo facilities or logging functions
+\item Problem: We want a well-structured solution for mapping an interface to the internal functionality of a system.
+All `extras' which have to do with the way user commands are input, additional commands such as undo and redo, and any
+non-application-specific processing of user commands, such as logging, should be kept separate from the interface to
+the internal functionality.
\end{itemize}
\end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
-\frametitle{Exercise Continued}
+\frametitle{Command Processor Pattern Continued}
\begin{itemize}
-\item The occurrence of the particular given value in an array element in $D$
-\item $D[i] = \mathit{key}$
-\item A condition for the addition with 1
-\item The repetition over a variable number of index values suggests quantification with the function addition and
-with the argument $1$
-\item $+(i : ? | ... \wedge D[i] = \mathit{key} : 1)$
+\item Solution: A separate component, the \structure{command processor}, takes care of all commands. The command
+processor component schedules the execution of commands, stores them for later undo, logs them for later analysis, and
+so on. The actual execution of the command is delegated to a supplier component within the application.
\end{itemize}
\end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
-\frametitle{Exercise Continued}
+\frametitle{Adapter Design Pattern}
-Identify relationships between essential objects
-
-\begin{itemize}
-
-\item Array $D$, index value, particular given value: $D[i] = \mathit{key}$
-\item Combine the above with count ($+$ conditionally with $1$)
-\item $\mathit{count} = +(i: \mathbb{N} | ... \leq i \leq ... \wedge D[i] = \mathit{key} : 1)$
-\item Range of $i$ missing
-\item Refer to original English text: $1$ to $n$
-\item $\mathit{count} = +(i: \mathbb{N} | 1 \leq i \leq n \wedge D[i] = \mathit{key} : 1)$
-\end{itemize}
+\structure{When have we used the adapter (or wrapper) design pattern?}
\end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
-\frametitle{Exercise: New Glossary Entry}
-
-Now we have a new entry for our glossary
+\frametitle{Adapter Design Pattern}
-\begin{itemize}
-
-\item count: $ +(i: \mathbb{N} | ... \leq i \leq ... \wedge ... : 1)$, where the ... defines the range of the
-quantified variable and the condition for counting
-
-\end{itemize}
+\includegraphics[scale=0.7]{../Figures/500px-AdapterPatternForWiki.jpg}
\end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
-\frametitle{Summary}
-
-\begin{itemize}
+\frametitle{Factory Pattern}
-\item Knowledge of English and Mathematics is necessary but not sufficient to translate into Mathematics
-\item Knowledge of subject area also needed
-\item Translating skills needed
-\item The three are different
+\includegraphics[scale=0.55]{../Figures/factory_pattern_uml_diagram.jpg}
-\end{itemize}
+\href{https://www.tutorialspoint.com/design_pattern/factory_pattern.htm}{Code}
\end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
-\frametitle{Summary}
+\frametitle{Singleton Pattern}
-\begin{itemize}
-
-\item Compile your own glossary
-\item Make intermediate steps and expressions conscious
-\item Modularize
-\item Organize systematically
-\item KISSS
-\end{itemize}
+\includegraphics[scale=1.7]{../Figures/Singleton.jpg}
\end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}
\frametitle{Tables Motivating Example: ptOn(c, s)}