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From the results arise that the optimal idle time is 30 s , as a compromise between productivity and reduction of heat accumulation , independently from the cooling strategy .
 material: s; material: as; concept or principle: productivity; concept or principle: reduction; machanical property: heat accumulation; manufacturing process: cooling
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:
 material: s; material: as; concept or principle: productivity; concept or principle: reduction; machanical property: heat accumulation; manufacturing process: cooling