Okay, the user wants me to translate "mass building" into French. Let me think about the correct term here. "Mass building" can refer to different things depending on the context. If it's about weight training or muscle gain, the common term in French is "muscu" or "entraînement musculaire". But if it's about constructing mass, like in a more general sense, maybe "construction de masse". However, considering the most likely context, especially if the user is referring to fitness, "muscu" is the slang term used in French-speaking countries. Let me confirm that. Yes, "muscu" is widely understood as muscle building or weight training. So the translation should be "muscu". Also, the user specified to output only the translation without explanations, so I need to make sure I just provide "muscu" as the response.
muscu
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