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Based on ground truss structures which were optimized for a given volume fraction and a set allowable deflection , the optimal strut dimensions were obtained with both algorithms .
 machine or equipment: truss; process parameter: volume fraction; application: set; machine or equipment: strut; engineering feature: dimensions; concept or principle: algorithms
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:
 machine or equipment: truss; process parameter: volume fraction; application: set; machine or equipment: strut; engineering feature: dimensions; concept or principle: algorithms