Okay, the user wants me to translate "reservation system" into Portuguese. Let me check the rules again. The first rule says to translate all content into Portuguese. The second rule states that if the content is already in Portuguese, leave it as is. The third rule is to provide only the translation without any explanations.
So, the input here is "reservation system". Since it's in English, I need to translate it. The correct translation in Portuguese would be "sistema de reservas". I should make sure there's no typo and that it's the most commonly used term. I don't see any reason to keep it unchanged here. Just output "sistema de reservas" without any extra text.
sistema de reservas
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