diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index 26c19a2..184bc8b 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -14,8 +14,21 @@
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+          },
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@@ -81,6 +94,7 @@
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@@ -97,6 +111,7 @@
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@@ -118,7 +133,9 @@
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+              "state": {
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@@ -148,31 +165,35 @@
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-    "Algo/Courses/Chapter 6 - Lists.md",
-    "Algo/Courses/Chapter 6 - Lists (Exercises).md",
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-    "Algo/CM/CM du 27 septembre.md",
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+    "Algo/B1/Séminaire/Chapter 3 - Case analysis.md",
+    "Algo/B1/Séminaire/Chapter 2 - Functions.md",
     "Prog/Loops.md",
-    "Algo/Séminaire/Chapter 4 - A bit of imperative.md",
-    "Algo/CM/Lists.md",
-    "Algo/Séminaire/Exercices seminaire.md",
+    "Algo/B1/Séminaire/Chapter 4 - A bit of imperative.md",
+    "Algo/B1/CM/Lists.md",
+    "Algo/B1/Séminaire/Exercices seminaire.md",
     "Prog",
-    "Algo/Séminaire/Remediation.md",
+    "Algo/B1/Séminaire/Remediation.md",
     "Methodologie/Communication.md",
     "Methodologie/Le cahier des charges.md",
     "Methodologie/Gestion.md",
-    "Algo/Courses",
+    "Algo/B1/Courses",
     "COM-ADMR/Séjour international EPITA.md",
-    "Algo/CM",
+    "Algo/B1/CM",
     "Electronic/Lecture 1.md",
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@@ -181,20 +202,16 @@
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-    "Algo/Séminaire/assets/fact function response.png",
-    "Algo/Séminaire/assets/recursivite-meme.png",
+    "Algo/B1/Séminaire/Introduction.md",
+    "Algo/B1/Séminaire/assets/exception-meme.png",
+    "Algo/B1/Séminaire/assets/filter-meme.png",
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+    "Algo/B1/Séminaire/assets/unitaire-meme.png",
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similarity index 100%
rename from Algo/CM/CM du 04 octobre.md
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similarity index 100%
rename from Algo/CM/CM du 27 septembre.md
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similarity index 100%
rename from Algo/CM/Lists.md
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similarity index 100%
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similarity index 100%
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similarity index 100%
rename from Algo/Séminaire/Chapter 1 - CAML basics.md
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similarity index 100%
rename from Algo/Séminaire/assets/recursivite-meme.png
rename to Algo/B1/Séminaire/assets/recursivite-meme.png
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similarity index 100%
rename from Algo/Séminaire/assets/unitaire-meme.png
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diff --git a/Algo/B2/Exercises/Imperative exercise.md b/Algo/B2/Exercises/Imperative exercise.md
new file mode 100644
index 0000000..a632d8e
--- /dev/null
+++ b/Algo/B2/Exercises/Imperative exercise.md	
@@ -0,0 +1,13 @@
+## Exercise 1:
+```python
+def test (n: int) -> bool:
+	if (n >= 100):
+		if (n < 1000):
+			return true
+		else:
+			return false
+	else:
+		return false
+```
+
+## Exercise 2: