1053
Most of today 's research on TO for AM is economically-driven and deals with support volume reduction , their complete elimination or simplified removal .
 concept or principle: research; manufacturing process: AM; application: support; concept or principle: reduction
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:
 concept or principle: research; manufacturing process: AM; application: support; concept or principle: reduction