995
In pursuit of streamlining the AM-workflow towards digitally print-ready designs , studies are increasingly investigating mathematically-based structural optimization approaches in conjunction with DfAM-specific constraints , providing a portfolio of solutions like generative design , which is gaining traction in industry .
 engineering feature: designs; concept or principle: structural optimization; enabling technology: generative design; application: industry
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: designs; concept or principle: structural optimization; enabling technology: generative design; application: industry