1981
For generative design for AM , there is still a lot of work to do to include more AM constraints and develop more efficient decision making tools to help designers define optimization criteria and candidate solution ranking schemes .
 enabling technology: generative design; manufacturing process: AM; manufacturing process: AM; machine or equipment: tools; concept or principle: optimization; concept or principle: solution
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:
 enabling technology: generative design; manufacturing process: AM; manufacturing process: AM; machine or equipment: tools; concept or principle: optimization; concept or principle: solution