diff --git a/slides/chapter-04.en.md b/slides/chapter-04.en.md
index ec32e95..1154434 100644
--- a/slides/chapter-04.en.md
+++ b/slides/chapter-04.en.md
@@ -115,7 +115,7 @@ Specifying file paths 👣
* file and folder structure = tree structure 🌳
@preview
-
+
@slide(layout=content-and-preview-with-category)
@@ -130,8 +130,8 @@ Excursion
### Absolute paths
* path from the root directory to a file
* the direcories are separated by special characters:
- * in UNIX: `/`
- * in Windows: `\`
+ * under UNIX: `/`
+ * under Windows: `\`
absolute path for `main.tex`
@@ -143,7 +143,7 @@ Excursion
@preview
-
+
@slide(layout=content-and-preview-with-category)
@@ -170,7 +170,7 @@ A **single dot ‘`.`’** in a relative path represents the current folder (in
@preview
-
+
@slide(layout=content-and-preview-with-category)
@@ -188,7 +188,7 @@ Specifying paths 👣
`./sections/part1.tex`
@preview
-
+
@slide(layout=content-and-preview-with-category)
@@ -208,7 +208,7 @@ Specifying paths 👣
**Two dots ‘`..`’** represent the parent folder of the current folder (in this case: `latex`, parent of `main`).
@preview
-
+
@slide(layout=content-only)
diff --git a/slides/chapter-15.en.md b/slides/chapter-15.en.md
index 52931b0..7e24423 100644
--- a/slides/chapter-15.en.md
+++ b/slides/chapter-15.en.md
@@ -84,7 +84,7 @@ two children at
edge from
parent path={(\tikzparentnode.south)
|- (\tikzchildnode.west)}]
-\node {/ oder C:}
+\node {/ or C:}
child { node {home}
child { node {knut}
child { node {pictures}}
diff --git a/svg/chapter-04/absolute-path-english-crop.svg b/svg/chapter-04/absolute-path-english-crop.svg
new file mode 100644
index 0000000..bb70b59
--- /dev/null
+++ b/svg/chapter-04/absolute-path-english-crop.svg
@@ -0,0 +1,148 @@
+
+
diff --git a/svg/chapter-04/absolute-path-english-orig.svg b/svg/chapter-04/absolute-path-english-orig.svg
new file mode 100644
index 0000000..a63c32e
--- /dev/null
+++ b/svg/chapter-04/absolute-path-english-orig.svg
@@ -0,0 +1,148 @@
+
+
diff --git a/svg/chapter-04/absolute-path-english.tex b/svg/chapter-04/absolute-path-english.tex
new file mode 100644
index 0000000..09aa158
--- /dev/null
+++ b/svg/chapter-04/absolute-path-english.tex
@@ -0,0 +1,33 @@
+\documentclass{article}
+\usepackage[ngerman]{babel}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{tikz}
+\usetikzlibrary{trees}
+\usepackage{verbatimbox}
+\usepackage[active,tightpage]{preview}
+\PreviewEnvironment{tikzpicture}
+\setlength\PreviewBorder{5pt}
+\begin{document}
+ \tikzstyle{every node}=[draw=black,thick,anchor=west]
+ \tikzstyle{selected}=[draw=red,fill=red!30]
+ \tikzstyle{foot}=[fill=gray!50]
+ \tikzstyle{rel}=[fill=blue!70]
+ \tikzstyle{partition}=[draw=white]
+
+ \begin{tikzpicture}[%
+ grow via three points={one child at (0.5,-0.7) and
+ two children at (0.5,-0.7) and (0.5,-1.4)},
+ edge from parent path={(\tikzparentnode.south) |- (\tikzchildnode.west)}]
+ \node [foot] {/ or C:}
+ child { node [foot] {home}
+ child { node [foot] {knut}
+ child { node {pictures}}
+ child { node [foot] {docs}
+ child { node [foot] {latex}
+ child { node [selected] { main.tex}}}
+ }
+ }
+ };
+ \end{tikzpicture}
+\end{document}
\ No newline at end of file
diff --git a/svg/chapter-04/relative-path-english-crop.svg b/svg/chapter-04/relative-path-english-crop.svg
new file mode 100644
index 0000000..dd32aa8
--- /dev/null
+++ b/svg/chapter-04/relative-path-english-crop.svg
@@ -0,0 +1,164 @@
+
+
diff --git a/svg/chapter-04/relative-path-english-orig.svg b/svg/chapter-04/relative-path-english-orig.svg
new file mode 100644
index 0000000..d84f4b6
--- /dev/null
+++ b/svg/chapter-04/relative-path-english-orig.svg
@@ -0,0 +1,164 @@
+
+
diff --git a/svg/chapter-04/relative-path-english.tex b/svg/chapter-04/relative-path-english.tex
new file mode 100644
index 0000000..20cdcc1
--- /dev/null
+++ b/svg/chapter-04/relative-path-english.tex
@@ -0,0 +1,36 @@
+\documentclass{article}
+\usepackage[ngerman]{babel}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{tikz}
+\usetikzlibrary{trees}
+\usepackage{verbatimbox}
+\usepackage[active,tightpage]{preview}
+\PreviewEnvironment{tikzpicture}
+\setlength\PreviewBorder{5pt}
+\begin{document}
+ \tikzstyle{every node}=[draw=black,thick,anchor=west]
+ \tikzstyle{selected}=[draw=red,fill=red!30]
+ \tikzstyle{foot}=[fill=gray!50]
+ \tikzstyle{rel}=[fill=blue!70]
+ \tikzstyle{partition}=[draw=white]
+
+ \begin{tikzpicture}[%
+ grow via three points={one child at (0.5,-0.7) and
+ two children at (0.5,-0.7) and (0.5,-1.4)},
+ edge from parent path={(\tikzparentnode.south) |- (\tikzchildnode.west)}]
+ \node {/ or C:}
+ child { node {home}
+ child { node {knut}
+ child { node {pictures}}
+ child { node {docs}
+ child { node [foot] {latex}
+ child { node [rel] { main.tex}}
+ child { node [selected] { part1.tex}}
+ }
+ }
+ }
+ };
+ \end{tikzpicture}
+
+\end{document}
\ No newline at end of file
diff --git a/svg/chapter-04/relative-path-subdir-english-crop.svg b/svg/chapter-04/relative-path-subdir-english-crop.svg
new file mode 100644
index 0000000..db227c3
--- /dev/null
+++ b/svg/chapter-04/relative-path-subdir-english-crop.svg
@@ -0,0 +1,176 @@
+
+
diff --git a/svg/chapter-04/relative-path-subdir-english-orig.svg b/svg/chapter-04/relative-path-subdir-english-orig.svg
new file mode 100644
index 0000000..65f1615
--- /dev/null
+++ b/svg/chapter-04/relative-path-subdir-english-orig.svg
@@ -0,0 +1,176 @@
+
+
diff --git a/svg/chapter-04/relative-path-subdir-english.tex b/svg/chapter-04/relative-path-subdir-english.tex
new file mode 100644
index 0000000..b87136a
--- /dev/null
+++ b/svg/chapter-04/relative-path-subdir-english.tex
@@ -0,0 +1,37 @@
+\documentclass{article}
+\usepackage[ngerman]{babel}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{tikz}
+\usetikzlibrary{trees}
+\usepackage{verbatimbox}
+\usepackage[active,tightpage]{preview}
+\PreviewEnvironment{tikzpicture}
+\setlength\PreviewBorder{5pt}
+\begin{document}
+ \tikzstyle{every node}=[draw=black,thick,anchor=west]
+ \tikzstyle{selected}=[draw=red,fill=red!30]
+ \tikzstyle{foot}=[fill=gray!50]
+ \tikzstyle{rel}=[fill=blue!70]
+ \tikzstyle{partition}=[draw=white]
+
+ \begin{tikzpicture}[%
+ grow via three points={one child at (0.5,-0.7) and
+ two children at (0.5,-0.7) and (0.5,-1.4)},
+ edge from parent path={(\tikzparentnode.south) |- (\tikzchildnode.west)}]
+ \node {/ or C:}
+ child { node {home}
+ child { node {knut}
+ child { node {pictures}}
+ child { node {docs}
+ child { node [foot] {latex}
+ child { node [rel] { main.tex}}
+ child {node [foot] {sections}
+ child { node [selected] {part1.tex}}
+ }
+ }
+ }
+ }
+ };
+ \end{tikzpicture}
+\end{document}
\ No newline at end of file
diff --git a/svg/chapter-04/relative-path-superdir-english-crop.svg b/svg/chapter-04/relative-path-superdir-english-crop.svg
new file mode 100644
index 0000000..9ff2c04
--- /dev/null
+++ b/svg/chapter-04/relative-path-superdir-english-crop.svg
@@ -0,0 +1,184 @@
+
+
diff --git a/svg/chapter-04/relative-path-superdir-english-orig.svg b/svg/chapter-04/relative-path-superdir-english-orig.svg
new file mode 100644
index 0000000..205596d
--- /dev/null
+++ b/svg/chapter-04/relative-path-superdir-english-orig.svg
@@ -0,0 +1,184 @@
+
+
diff --git a/svg/chapter-04/relative-path-superdir-english.tex b/svg/chapter-04/relative-path-superdir-english.tex
new file mode 100644
index 0000000..701a179
--- /dev/null
+++ b/svg/chapter-04/relative-path-superdir-english.tex
@@ -0,0 +1,40 @@
+\documentclass{article}
+\usepackage[ngerman]{babel}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{tikz}
+\usetikzlibrary{trees}
+\usepackage{verbatimbox}
+\usepackage[active,tightpage]{preview}
+\PreviewEnvironment{tikzpicture}
+\setlength\PreviewBorder{5pt}
+\begin{document}
+ \tikzstyle{every node}=[draw=black,thick,anchor=west]
+ \tikzstyle{selected}=[draw=red,fill=red!30]
+ \tikzstyle{foot}=[fill=gray!50]
+ \tikzstyle{rel}=[fill=blue!70]
+ \tikzstyle{partition}=[draw=white]
+
+ \begin{tikzpicture}[%
+ grow via three points={one child at (0.5,-0.7) and
+ two children at (0.5,-0.7) and (0.5,-1.4)},
+ edge from parent path={(\tikzparentnode.south) |- (\tikzchildnode.west)}]
+ \node {/ or C:}
+ child { node {home}
+ child { node {knut}
+ child { node {pictures}}
+ child { node {docs}
+ child { node [foot] {latex}
+ child { node [foot] {main}
+ child { node [rel] { main.tex}}
+ }
+ child [missing] {}
+ child {node [foot] {sections}
+ child { node [selected] {part1.tex}}
+ }
+ }
+ }
+ }
+ };
+ \end{tikzpicture}
+\end{document}
\ No newline at end of file
diff --git a/svg/chapter-04/tree-english-crop.svg b/svg/chapter-04/tree-english-crop.svg
new file mode 100644
index 0000000..b3dbb7e
--- /dev/null
+++ b/svg/chapter-04/tree-english-crop.svg
@@ -0,0 +1,148 @@
+
+
diff --git a/svg/chapter-04/tree-english-orig.svg b/svg/chapter-04/tree-english-orig.svg
new file mode 100644
index 0000000..181b3c6
--- /dev/null
+++ b/svg/chapter-04/tree-english-orig.svg
@@ -0,0 +1,148 @@
+
+
diff --git a/svg/chapter-04/tree-english.tex b/svg/chapter-04/tree-english.tex
new file mode 100644
index 0000000..c020f71
--- /dev/null
+++ b/svg/chapter-04/tree-english.tex
@@ -0,0 +1,33 @@
+\documentclass{article}
+\usepackage[ngerman]{babel}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{tikz}
+\usetikzlibrary{trees}
+\usepackage{verbatimbox}
+\usepackage[active,tightpage]{preview}
+\PreviewEnvironment{tikzpicture}
+\setlength\PreviewBorder{5pt}
+\begin{document}
+ \tikzstyle{every node}=[draw=black,thick,anchor=west]
+ \tikzstyle{selected}=[draw=red,fill=red!30]
+ \tikzstyle{foot}=[fill=gray!50]
+ \tikzstyle{rel}=[fill=blue!70]
+ \tikzstyle{partition}=[draw=white]
+
+ \begin{tikzpicture}[%
+ grow via three points={one child at (0.5,-0.7) and
+ two children at (0.5,-0.7) and (0.5,-1.4)},
+ edge from parent path={(\tikzparentnode.south) |- (\tikzchildnode.west)}]
+ \node {/ or C:}
+ child { node {home}
+ child { node {knut}
+ child { node {pictures}}
+ child { node {docs}
+ child { node { latex}
+ child { node { main.tex}}}
+ }
+ }
+ };
+ \end{tikzpicture}
+\end{document}
\ No newline at end of file