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+\headcommand {\beamer@framepages {2}{2}}
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+\headcommand {\beamer@subsectionpages {1}{2}}
+\headcommand {\sectionentry {1}{Experimentation From a Software Point of View}{3}{Experimentation From a Software Point of View}{0}}
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+\headcommand {\beamer@framepages {3}{3}}
+\headcommand {\slideentry {1}{0}{2}{4/4}{}{0}}
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+\headcommand {\beamer@sectionpages {3}{4}}
+\headcommand {\beamer@subsectionpages {3}{4}}
+\headcommand {\sectionentry {2}{Nix}{5}{Nix}{0}}
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+\headcommand {\beamer@framepages {9}{10}}
+\headcommand {\beamer@subsectionpages {5}{10}}
+\headcommand {\beamer@subsectionentry {0}{2}{1}{11}{Expression Language}}
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diff --git a/slides.out b/slides.out
new file mode 100644
index 0000000000000000000000000000000000000000..30e0e86be70fac6f061ccfb3c5fd64066813f782
--- /dev/null
+++ b/slides.out
@@ -0,0 +1,6 @@
+\BOOKMARK [2][]{Outline0.1}{Experimentation From a Software Point of View}{}% 1
+\BOOKMARK [2][]{Outline0.2}{Nix}{}% 2
+\BOOKMARK [3][]{Outline0.2.1.11}{Expression Language}{Outline0.2}% 3
+\BOOKMARK [3][]{Outline0.2.2.13}{Package Manager}{Outline0.2}% 4
+\BOOKMARK [2][]{Outline0.3}{Nix Structure}{}% 5
+\BOOKMARK [1][]{Outline1}{Appendix}{}% 6
diff --git a/slides.pdf b/slides.pdf
index c2ba6991a4d2f1b8719d28944fda4c9bab5a018b..380ac1297a2e941698f3300e9a6b0146bedc06f0 100644
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diff --git a/slides.snm b/slides.snm
new file mode 100644
index 0000000000000000000000000000000000000000..08652a391b18658c759a224b2985e702b8457ee3
--- /dev/null
+++ b/slides.snm
@@ -0,0 +1,2 @@
+\beamer@slide {toc<1>}{2}
+\beamer@slide {toc}{2}
diff --git a/slides.tex b/slides.tex
index 8391983bf274c1e1731d3744caf369683c867ab2..79a18ea8dc069dfa178acad1ccdd471ecdcc4b09 100644
--- a/slides.tex
+++ b/slides.tex
@@ -104,7 +104,8 @@
 
 \begin{frame}{Experimentation Codes}
 \begin{itemize}
-  \item Experimentations source codes are often \emph{Had-hoc}.
+  \item Experimentations codes are often \emph{ad hoc}.
+    \note{Publish and perish\\}
   \item Few or no indications describing how to build them
     \note{Relevant compilation options, dependencies...}
   \item Few informations about the execution.
@@ -114,9 +115,9 @@
 
 \begin{frame}{The Problem}
 \begin{itemize}
-  \item Hinder the repeatability of the experimentations
+  \item Hinder the repeatability of the experimentations.
     \note{Hard to verify what you did, for reviewer for instance.}
-  \item Hard to continue someone else work
+  \item Hard to continue someone else work.
     \note{Trying other inputs, fixing bugs etc}
     \note{Encourage restarting from scratch}
 \end{itemize}
@@ -129,7 +130,7 @@
   \begin{itemize}
       \item Documenting the building procedures.
         \note{How to build it, relevant compilation flags etc\\}
-      \item It dependencies.
+      \item What are the dependencies of the project.
         \note{Which libraries etc\\}
       % \item the dependencies.
       % \item Using literate programming ?
@@ -140,10 +141,10 @@
 The running environment should be explicit:
 
   \begin{itemize}
-      \item the running environment should be defined
+      \item Which runtime is used?
         \note{
-          How(had-hoc script, complex runtime etc),
-          Where(your laptop, your old laptop etc) you run you experiment.}
+          How(had-hoc script, complex runtime etc), \\
+          Where(your laptop, your old laptop etc) you run you experiment.\\}
 
       \item Documenting how to run the experiment.
         \note{The input, the running scripts etc \\}
@@ -185,7 +186,7 @@ The running environment should be explicit:
     % \item Composability,
       \note{why\\}
     \item Decentralized package repository.
-      \note{Packages can come from different places.\\}
+      \note{Packages can come from different places, thus you can have yours.\\}
     \item Explicit build process,
       \note{Every deps need to be stated\\}
       \note{The building process is explicit in Nix\\}
@@ -193,7 +194,7 @@ The running environment should be explicit:
       \note{Build Once, build twice (six month later)\\}
       \note{Possibility to describing full software environment\\}
       \note{From building environment, to runtime and data analysis.\\}
-    \item Application Portability
+    \item Application portability
       \note{build on my laptop, run on g5k}
     \end{itemize}
     }
@@ -286,7 +287,7 @@ The running environment should be explicit:
       \item Unprivileged package installation
       \item Provides isolated build \& runtime environments
       \item Reproducible build from source
-      \item Binary Cache
+      \item Binary cache
       \item Garbage collection
       \item Declarative \& Imperative use.
     \end{itemize}
@@ -417,11 +418,75 @@ The result of the build action is automatically placed into the nix store.
 
 \end{frame}
 
-% \subsection{NixPkgs}
+\begin{frame}[fragile]{Store}
+
+\begin{tcolorbox}[colframe=black,colback=gray!10,coltext=black]
+  Each package contains its own tree.
+\end{tcolorbox}
+
+  \begin{lstlisting}[basicstyle=\small]
+/nix/store/hash-packagename/..
+                           /bin/package
+                           /lib/package.so
+                           /share/
+                           .
+  \end{lstlisting}
+
+\end{frame}
+
+\begin{frame}[fragile]{Store}
+\begin{columns}
+\begin{column}{0.5\textwidth}
+
+\begin{tcolorbox}[colframe=black,colback=gray!10,coltext=black]
+  Packages can reference/depend on other packages.
+\end{tcolorbox}
+
+\end{column}
+\begin{column}{0.5\textwidth}  %%<--- here
+    \begin{center}
+    \vspace{-4em}
+  \includegraphics[scale=0.4]{./figures/store.png}
+     \end{center}
+\end{column}
+\end{columns}
+
+\end{frame}
+
+\begin{frame}[fragile]{Store}
+
+\begin{tcolorbox}[colframe=black,colback=gray!10,coltext=black]
+  The store can be used as a binary cache.
+\end{tcolorbox}
+
+  \vspace{1em}
+  Thanks to the name of a package.
+
+  \begin{lstlisting}[basicstyle=\small]
+/nix/store/hash-packagename
+  \end{lstlisting}
+
+ \vspace{1em}
+  Missing dependencies can be identified and downloaded from a distant store.
+
+\end{frame}
+
+\begin{frame}
+  A derivation is a build action written in Nix. \\
+  \vspace{1em}
+  Used to build package. \\
+  \vspace{1em}
+  The resulting package is stocked in the store, \\
+  identified with a unique path. \\
+  \vspace{1em}
+  In which it can refer to other packages.
+  \vspace{1em}
+\end{frame}
+
 
 \begin{frame}[fragile]{Nixpkgs}
 
-  How and where can we get derivations ?
+  How and where can we get derivations?
 
   \pause
   \vspace{1em}
@@ -462,7 +527,6 @@ The result of the build action is automatically placed into the nix store.
     \item nixpkgs-19.03 (current stable)
     \item nixpkgs-18.09 (outdated)
   \end{itemize}
-  }
 
   \only<2>{
 
@@ -471,7 +535,7 @@ The result of the build action is automatically placed into the nix store.
     Channels are not fully reproducible, as they are subject to updates.
 \end{tcolorbox}
   \vspace{1em}
-  As experimenters,  we will use another mechanism called pinning.
+    As experimenters, we will use another mechanism called pinning.
   }
 
 \end{frame}
@@ -492,11 +556,11 @@ The result of the build action is automatically placed into the nix store.
   How do we use Nix ?
   \vspace{1em}
   \begin{itemize}
-    \item \textit{nix-build} : build a derivation (that will be placed to the nix store),
-    \item \textit{nix-env} : install a package (in your current environment)
+    \item \textit{nix-build}: build a derivation (that will be placed to the nix store),
+    \item \textit{nix-env}: install a package (in your current environment)
       \note{Speak about profiles?},
-    \item \textit{nix-shell} : start a shell in the build environment of a derivation,
-    \item \textit{nix search} : search for available packages.
+    \item \textit{nix search}: search for available packages.
+    \item \textit{nix-shell}: start a shell in the build environment of a derivation,
   \end{itemize}
 \end{frame}
 
@@ -510,14 +574,13 @@ The result of the build action is automatically placed into the nix store.
 Start an interactive session within the build environment of a derivation.
 
 \vspace{1em}
-Enables to describe environment, and start a shell within it.
-
+Enables to describe environment, in which we can start a shell.
 
 \vspace{-1em}
   \begin{lstlisting}[language=Nix,basicstyle=\small]
 {
   pkgs ? import (fetchTarball
-    https://github.com/achive/e860b629bc0d1f9b.tar.gz)
+    https://github.com/archive/e860b629bc0d1f9b.tar.gz)
   {}
 }:
 pkgs.mkShell rec {
@@ -527,7 +590,6 @@ pkgs.mkShell rec {
 
 \end{frame}
 
-
 \begin{frame}[fragile]{Why it is reproducible ?}
   Writting a package for an application requires to state down every dependencies. \\
 
@@ -562,16 +624,23 @@ src = fetgit {
 \end{frame}
 
 \begin{frame}[fragile]
-  % Nix is a good solution for describing reconstructible environments.
-  Nix ensures the reproducibility of software environments.
+
+  With Nix you can define and share complex experiment environment.
+  \begin{itemize}
+    \item It will be reconstructible.
+    \item The dependencies will be clearly stated.
+  \end{itemize}
+
+  % Nix ensures the reproducibility of software environments.
   \vspace{1em}
 
-  \note{In this slide, I want to clarify some points.\\
-  Using nix as a runtime may be a bad idea as it would be limited.}
-  \begin{tcolorbox}[colframe=red!37,colback=red!10,coltext=black]
-    Nix is not a runtime, \\
-    Nix is not a database.
-  \end{tcolorbox}
+  %\begin{tcolorbox}[colframe=red!37,colback=red!10,coltext=black]
+  %  Nix is not a runtime, \\
+  %\end{tcolorbox}
+  \note{
+   Nix is not a runtime, (Results will be stored in the store also, hard to distributes etc)\\
+   Nix offers nothing to deals with data
+  }
 
 \end{frame}
 
diff --git a/slides.toc b/slides.toc
new file mode 100644
index 0000000000000000000000000000000000000000..ec2baef5abadc93912d4d890aa354e3c459da632
--- /dev/null
+++ b/slides.toc
@@ -0,0 +1,5 @@
+\beamer@sectionintoc {1}{Experimentation From a Software Point of View}{3}{0}{1}
+\beamer@sectionintoc {2}{Nix}{5}{0}{2}
+\beamer@subsectionintoc {2}{1}{Expression Language}{11}{0}{2}
+\beamer@subsectionintoc {2}{2}{Package Manager}{13}{0}{2}
+\beamer@sectionintoc {3}{Nix Structure}{14}{0}{3}
diff --git a/slides.vrb b/slides.vrb
new file mode 100644
index 0000000000000000000000000000000000000000..341cdc3b242b7e30097219834cb504612c9bddbc
--- /dev/null
+++ b/slides.vrb
@@ -0,0 +1 @@
+\center Thanks.