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Hollander produced a variety of Ti6Al4V implants , ranging from porous cylinder to solid human vertebra model with irregular shapes .
 material: Ti6Al4V; application: implants; machanical property: porous; concept or principle: model
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: Ti6Al4V; application: implants; machanical property: porous; concept or principle: model