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 # Part 2：Exercice 02
-### 2.1 Using a notebook
-## 2.1.1  About Calculating π
+## 2.1 Using a notebook
+### 2.1.1  About Calculating π
 My computer tells me that π is approximately **3.141592653589793**
 
-## 2.1.2  Using Buffon's Needle Method
\ No newline at end of file
+### 2.1.2  Using Buffon's Needle Method
\ No newline at end of file