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CE=C+Mn/6+(Ni+Cu)/15+(Cr+Mo+V)/5 CE=C+Mn/15+(Ni+Cu)/6+(Cr+Mo+O)/5 CE=C+Mn/5+(Ni+Cu)/6+(Cr+Mo+V)/15 CE=C+Mn/15+(Ni+Cu)/5+(Cr+Mo+V)/6