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It allows producing small quantities of structural and functional parts and thus , is particularly interesting for racing vehicles , where light-weight alloys and composites are used to obtain highly complex structures .
 machanical property: light-weight; material: alloys; material: composites; concept or principle: complex structures
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:
 machanical property: light-weight; material: alloys; material: composites; concept or principle: complex structures