diff --git a/bin/C12_Recursivite/App.class b/bin/C12_Recursivite/App.class
deleted file mode 100644
index 5608f23..0000000
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diff --git a/bin/Series/S08/S08EX01b.class b/bin/Series/S08/S08EX01b.class
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index 0000000..4082853
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diff --git a/bin/Series/S08/S08EX02a.class b/bin/Series/S08/S08EX02a.class
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index 0000000..6263958
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diff --git a/bin/Series/S08/S08EX02b.class b/bin/Series/S08/S08EX02b.class
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index 0000000..c007a47
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diff --git a/bin/Series/S08/S08EX02c.class b/bin/Series/S08/S08EX02c.class
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index 0000000..3039c8b
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diff --git a/bin/Series/S08/S08EX02d.class b/bin/Series/S08/S08EX02d.class
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index 0000000..2436499
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diff --git a/bin/Series/S08/serie8.pdf b/bin/Series/S08/serie8.pdf
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index 0000000..c9feac5
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diff --git a/src/C12_Recursivite/App.java b/src/C12_Recursivite/App.java
deleted file mode 100644
index c9fc667..0000000
--- a/src/C12_Recursivite/App.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package C12_Recursivite;
-
-public class App {
-    public static void main(String[] args) throws Exception {
-        System.out.println("Hello, World!");
-    }
-}
diff --git a/src/Series/S08/S08EX01b.java b/src/Series/S08/S08EX01b.java
new file mode 100644
index 0000000..256298d
--- /dev/null
+++ b/src/Series/S08/S08EX01b.java
@@ -0,0 +1,14 @@
+package Series.S08;
+
+public class S08EX01b {
+    public static void main(String[] args) {
+        System.out.println("Result: " + f2(6,5));
+    }
+
+    static int f2(int x, int y){
+        if (x <= 0) return 0;
+        if (y >= x) return 1 + f2(y,x);
+
+        return 2 + f2(x-3,y-1);
+    }
+}
diff --git a/src/Series/S08/S08EX02a.java b/src/Series/S08/S08EX02a.java
new file mode 100644
index 0000000..f9f386d
--- /dev/null
+++ b/src/Series/S08/S08EX02a.java
@@ -0,0 +1,14 @@
+package Series.S08;
+
+public class S08EX02a {
+    public static void main(String[] args) {
+        int n = 5;
+        System.out.println("Factoriel de " + n + " = " + fact(n));
+    }
+
+    static long fact(int n){
+        if (n <= 1) return 1;
+        
+        return n*fact(n-1);
+    }
+}
diff --git a/src/Series/S08/S08EX02b.java b/src/Series/S08/S08EX02b.java
new file mode 100644
index 0000000..93e6e34
--- /dev/null
+++ b/src/Series/S08/S08EX02b.java
@@ -0,0 +1,17 @@
+package Series.S08;
+
+public class S08EX02b {
+    public static void main(String[] args) {
+        int x = 2;
+        int n = 8;
+
+        System.out.println(x + " puissance " + n + " = " + power(x, n));
+    }
+
+    static long power(int x, int n){
+        if (n <= 0) return 1;
+        if (n == 1) return x;
+
+        return x * power(x, n-1);
+    }
+}
diff --git a/src/Series/S08/S08EX02c.java b/src/Series/S08/S08EX02c.java
new file mode 100644
index 0000000..c3b3086
--- /dev/null
+++ b/src/Series/S08/S08EX02c.java
@@ -0,0 +1,17 @@
+package Series.S08;
+
+public class S08EX02c {
+    public static void main(String[] args) {
+        String dep = "1234";
+        System.out.println(dep + " -> " + stringsep(dep));
+    }
+
+    static String stringsep(String s){
+        if (s == null) return null;
+        if (s.length() <= 1) return s;
+
+        return "" + s.charAt(0) + ',' + stringsep(s.substring(1));
+    }
+
+
+}
diff --git a/src/Series/S08/S08EX02d.java b/src/Series/S08/S08EX02d.java
new file mode 100644
index 0000000..e1e3504
--- /dev/null
+++ b/src/Series/S08/S08EX02d.java
@@ -0,0 +1,15 @@
+package Series.S08;
+
+public class S08EX02d {
+    public static void main(String[] args) {
+        char l = 'f';
+        System.out.println(l + " -> " + letters(l));
+    }
+
+    static String letters(char l){
+        if (l == 0) return null;
+        if (l == 'a') return String.valueOf(l);
+
+        return letters((char)(l-1)) + l;
+    }
+}
diff --git a/src/Series/S08/serie8.pdf b/src/Series/S08/serie8.pdf
new file mode 100644
index 0000000..c9feac5
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