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However , since sand casting is suited for multiple units of parts , the time and resources needed to produce a single part through sand casting is not ideal for a competitive market .
 sand casting, sand casting
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:
 sand casting, sand casting