diff --git a/27oct/ex4.py b/27oct/ex4.py
new file mode 100644
index 0000000..1458523
--- /dev/null
+++ b/27oct/ex4.py
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+import random
+
+
+def creer_enchevetrements(bag, i, max_en):
+    """creer une suite d'enchevetrement aleatoire """
+    autre_baguettes = bag[:]
+    autre_baguettes.pop(i)
+    return [(random.choice(autre_baguettes), i) for _ in range(random.randint(1, max_en))]
+
+
+if __name__ == "__main__":
+    for _ in range(100):
+        p = list(range(42))
+        random.shuffle(p)
+        print(creer_enchevetrements(p, 8, 10))
diff --git a/27oct/ex5.py b/27oct/ex5.py
new file mode 100644
index 0000000..7cca09b
--- /dev/null
+++ b/27oct/ex5.py
@@ -0,0 +1,18 @@
+import random
+from ex4 import creer_enchevetrements
+
+
+def creer_mikado(bag):
+    """creer un sac de mikado avec des enchevetrement aleatoire """
+    game = list()
+    nombre_enchevetrements = random.randint(1, len(bag))
+    while len(game) < nombre_enchevetrements:
+        game.append(creer_enchevetrements(bag, random.choice(bag), 1)[0])
+    return game
+
+
+if __name__ == "__main__":
+    for _ in range(100):
+        bag = list(range(random.randint(2, 42)))
+        random.shuffle(bag)
+        print(creer_mikado(bag))
diff --git a/27oct/ex6.py b/27oct/ex6.py
new file mode 100644
index 0000000..ac76228
--- /dev/null
+++ b/27oct/ex6.py
@@ -0,0 +1,27 @@
+def peut_retirer(i, bag, jeu):
+    """verifie si une baguette peut etre retiree """
+    on_top = bag[:]
+    for intersection in jeu:
+        if intersection[1] in on_top:
+            on_top.remove(intersection[1])
+    return i in on_top
+
+
+def retirer(i, bag, jeu):
+    bag.remove(i)
+    for intersection in jeu:
+        if i in intersection:
+            jeu.remove(intersection)
+
+
+if __name__ == "__main__":
+    from ex5 import creer_mikado
+
+    bag = list(range(10))
+    game = creer_mikado(bag)
+    print(game)
+    retirer(5, bag, game)
+    print(game)
+    # print(bag)
+    # print(game)
+    # print(peut_retirer(5, bag, game))
diff --git a/27oct/ex7.py b/27oct/ex7.py
new file mode 100644
index 0000000..c066f9e
--- /dev/null
+++ b/27oct/ex7.py
@@ -0,0 +1,33 @@
+from ex6 import peut_retirer, retirer
+
+
+def quel_ordre(_bag, jeu):
+    """retourne un ordre possible sinon None """
+    bag = _bag[:]
+    order = list()
+    last_order = None
+    while order != last_order:
+        last_order = order[:]
+        print(last_order)
+        for i in bag:
+            if peut_retirer(i, bag, jeu):
+                order.append(i)
+                retirer(i, bag, jeu)
+    bag_t, order_t = bag[:], order[:]
+    bag_t.sort()
+    order_t.sort()
+    print(order_t, bag_t)
+    if(order_t == bag_t):
+        return order
+    else:
+        return None
+
+
+if __name__ == "__main__":
+    from ex5 import creer_mikado
+
+    bag = list(range(10))
+    game = creer_mikado(bag)
+    print(bag)
+    print(game)
+    print(quel_ordre(bag, game))
diff --git a/27oct/serie6.pdf b/27oct/serie6.pdf
new file mode 100644
index 0000000..00b1a11
Binary files /dev/null and b/27oct/serie6.pdf differ