1840
This titanium alloy bracket was designed to replace a traditional composite bracket in an experimental vehicle for the Shell eco-challenge .
 material: titanium alloy; machine or equipment: bracket; engineering feature: designed; material: composite; machine or equipment: bracket; concept or principle: experimental; machine or equipment: Shell
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: titanium alloy; machine or equipment: bracket; engineering feature: designed; material: composite; machine or equipment: bracket; concept or principle: experimental; machine or equipment: Shell