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‹ › In (M)aterials, there\'s generally a trade-off between hardness and brittleness (e.g., a very hard material will likely be relatively brittle) | 筋肉 ポルノ | Hot XXX Gays
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In (M)aterials, there's generally a trade-off between hardness and brittleness (e.g., a very hard material will likely be relatively brittle)

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