1090
The objective of the research was to develop an enhanced BOM ( E.BOM ) for WAAM , which takes the spreading of the weld beads into consideration .
 concept or principle: research; manufacturing process: WAAM; concept or principle: weld beads
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: WAAM; concept or principle: weld beads