diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index f91fb4c..f32b144 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -13,7 +13,7 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "Algo/Séminaire/Chapter 3 - Case analysis.md",
+                "file": "Algo/Séminaire/Exercices seminaire.md",
                 "mode": "source",
                 "source": false
               }
@@ -69,8 +69,7 @@
       }
     ],
     "direction": "horizontal",
-    "width": 300,
-    "collapsed": true
+    "width": 300
   },
   "right": {
     "id": "b83c16dd7908c658",
@@ -86,7 +85,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "Algo/Séminaire/Chapter 3 - Case analysis.md",
+                "file": "Algo/Séminaire/Exercices seminaire.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -103,7 +102,7 @@
             "state": {
               "type": "outgoing-link",
               "state": {
-                "file": "Algo/Séminaire/Chapter 3 - Case analysis.md",
+                "file": "Algo/Séminaire/Exercices seminaire.md",
                 "linksCollapsed": false,
                 "unlinkedCollapsed": true
               }
@@ -126,7 +125,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "Algo/Séminaire/Chapter 3 - Case analysis.md"
+                "file": "Algo/Séminaire/Exercices seminaire.md"
               }
             }
           }
@@ -149,8 +148,8 @@
   },
   "active": "26ca4bd66426e29b",
   "lastOpenFiles": [
-    "Algo/Séminaire/Exercices seminaire.md",
     "Algo/Séminaire/Chapter 3 - Case analysis.md",
+    "Algo/Séminaire/Exercices seminaire.md",
     "Algo/Séminaire/Chapter 2 - Functions.md",
     "Algo/Séminaire/Chapter 1 - CAML basics.md",
     "Algo/Séminaire/Introduction.md",
diff --git a/Algo/Séminaire/Exercices seminaire.md b/Algo/Séminaire/Exercices seminaire.md
index 1efffae..6ed0948 100644
--- a/Algo/Séminaire/Exercices seminaire.md	
+++ b/Algo/Séminaire/Exercices seminaire.md	
@@ -196,5 +196,6 @@ val rate_express : float -> float = <fun>
 # let rate rt kg = match rt with
 	x when x = "economic" -> rate_eco(kg)
 	| x when x = "standard" -> rate_standard(kg)
-	| x when x = "express" -> rate_express(kg);;
+	| x when x = "express" -> rate_express(kg)
+	| _ -> invalid_arg "Bad type of shipping class"
 val rate : string -> float -> float = <fun>