diff --git a/05_Mandelbulb/Mandelbulb.lhs b/05_Mandelbulb/Mandelbulb.lhs
index 8ebc89f..08fe85c 100644
--- a/05_Mandelbulb/Mandelbulb.lhs
+++ b/05_Mandelbulb/Mandelbulb.lhs
@@ -47,21 +47,21 @@ It means, the user input will transform the world state.
 > -- Centralize all user input interaction
 > inputActionMap :: InputMap World
 > inputActionMap = inputMapFromList [
->      (Press 'k' , rotate xdir 5)
+>      (Press 'k' , rotate xdir   5)
 >     ,(Press 'i' , rotate xdir (-5))
->     ,(Press 'j' , rotate ydir 5)
+>     ,(Press 'j' , rotate ydir   5)
 >     ,(Press 'l' , rotate ydir (-5))
->     ,(Press 'o' , rotate zdir 5)
+>     ,(Press 'o' , rotate zdir   5)
 >     ,(Press 'u' , rotate zdir (-5))
->     ,(Press 'f' , translate xdir 0.1)
+>     ,(Press 'f' , translate xdir   0.1)
 >     ,(Press 's' , translate xdir (-0.1))
->     ,(Press 'e' , translate ydir 0.1)
+>     ,(Press 'e' , translate ydir   0.1)
 >     ,(Press 'd' , translate ydir (-0.1))
->     ,(Press 'z' , translate zdir 0.1)
+>     ,(Press 'z' , translate zdir   0.1)
 >     ,(Press 'r' , translate zdir (-0.1))
->     ,(Press '+' , zoom 1.1)
+>     ,(Press '+' , zoom    1.1)
 >     ,(Press '-' , zoom (1/1.1))
->     ,(Press 'h' , resize 1.2)
+>     ,(Press 'h' , resize    1.2)
 >     ,(Press 'g' , resize (1/1.2))
 >     ]
 
diff --git a/06_Mandelbulb/Mandelbulb.lhs b/06_Mandelbulb/Mandelbulb.lhs
index bfad62d..d8d7c97 100644
--- a/06_Mandelbulb/Mandelbulb.lhs
+++ b/06_Mandelbulb/Mandelbulb.lhs
@@ -1,17 +1,23 @@
  ## Optimization
 
-All feel good from the architecture point of vue.
-More precisely, the separation between rendering and world behavior is clear.
-But this is extremely slow now.
-Because we compute the Mandelbulb for each frame now.
+From the architecture stand point all is clear.
+If you read the code, you'll see I didn't made everything perfect, for example, I didn't coded nicely the lights.
+But I believe it is a good first step and it will be easy to go further.
+The separation between rendering and world behavior is clear.
+Unfortunately the program of the preceding session is extremely slow.
+We compute the Mandelbulb for each frame now.
 
 Before we had
 
-   Constant Function -> Constant List of Triangles -> Display
+<code class="no-highlight">
+Constant Function -> Constant List of Triangles -> Display
+</code>
 
 Now we have 
 
-    World -> Function -> List of Objects -> Atoms -> Display
+<code class="no-highlight">
+World -> Function -> List of Objects -> Atoms -> Display
+</code>
 
 And the World state could change. 
 Then it is no more straightforward for the compiler to understand
diff --git a/prev b/prev
index 15c4b06..ea52c96 100755
--- a/prev
+++ b/prev
@@ -16,7 +16,11 @@ print -- "Create article"
 
 print -- "Copy source codes"
 ycp() {
-    print -- $*
+    local precedent=""
+    for e in $*;do
+        [[ $precedent != "" ]] && print -- "\t$precedent"
+        precedent=$e
+    done
     cp $*
 }
 latestArticleDir=$(ls -l $webroot/latest.ymd | perl -pi -e 's#.*/##; s#.md$##')
@@ -25,10 +29,10 @@ for langue in en fr; do
     [[ ! -d $dst ]] && mkdir -p $dst
     ycp *.lhs(N) $dst
     for dir in ??_*(N/); do
-        mkdir $dst/$dir
-        ycp $dir/*.{lhs,hs} $dst/$dir
+        [[ ! -d $dst/$dir ]] && mkdir $dst/$dir
+        ycp $dir/*.{lhs,hs}(.N) $dst/$dir
     done
 done
-
+print -- "\nRecompile"
 cd $webroot
 ./tasks/recompile