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Another important motivation behind the design of biocompatible Ti alloys is the opportunity to decrease the modulus of Ti alloys by adding elements .
 engineering feature: design; material: biocompatible Ti alloys; material: Ti alloys; material: elements
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:
 engineering feature: design; material: biocompatible Ti alloys; material: Ti alloys; material: elements