7300
To overcome the hardness drop , a new alloy LC2 ( Febal−x-Cr-Mo-W-V-Cox ) was blended by addition of 3–5 % of Co in LC1 .
 hardness, alloy, Co
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 hardness, alloy, Co