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The wear rates of carbon steel cladding-2 ( 1.99 × 10−7 mm3·N−1·mm−1 ) and carbon steel cladding-3 ( 2.49 × 10−7 mm3·N−1·mm−1 ) approximate the wear rate of HSS ( 1.59 × 10−7 mm3·N−1·mm−1 ) .
 concept or principle: wear; material: carbon steel; material: carbon steel; concept or principle: wear; material: HSS
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 concept or principle: wear; material: carbon steel; material: carbon steel; concept or principle: wear; material: HSS