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src/cours/SUMMARY.md

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+# Summary
+
+- [Chapter 1](./chapter_1.md)

src/cours/chapter_1.md

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+# Chapter 1
+```admonish warning
+A beautifully styled message.
+```
+
+```mermaid
+graph TD;
+    A-->B;
+    A-->C;
+    B-->D;
+    C-->D;
+```