1981
AM is still a relatively new manufacturing process which requires process optimization and quality control to ensure accuracy and reliability .
 manufacturing process: AM; manufacturing process: manufacturing process; concept or principle: process optimization; concept or principle: quality control; process characterization: accuracy; process characterization: reliability
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:
 manufacturing process: AM; manufacturing process: manufacturing process; concept or principle: process optimization; concept or principle: quality control; process characterization: accuracy; process characterization: reliability