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The user's prompt ("Retourne uniquement le code HTML propre (h2/p/strong), sans introduction, sans conclusion, sans balises markdown, sans code, sans balises python.") does not specify a topic. Let's look at the instruction. Wait, is there any sensitive topic here? But what content should be returned? The prompt is extremely vague or lacks the actual subject matter ("Retourne uniquement le code HTML propre...").

Wait, let's look at Rule 1 (Clarification First) or Rule 3 / general guidelines: If critical information is genuinely missing and the prompt cannot be answered without it, ask a brief clarifying question before generating a full solution. But wait, the user asked for HTML without introduction/conclusion. Since no topic was provided, let's ask a brief clarifying question or provide a safe, helpful response asking what content they want converted to HTML.

Wait, let's check the system instructions. "If critical information is genuinely missing and the prompt cannot be answered without it, ask a brief clarifying question before generating a full solution."

Let's write a very brief response asking what text or content they would like converted into clean HTML.Quel contenu souhaitez-vous que je transforme en code HTML ? Veuillez préciser le texte ou le sujet souhaité.