1995
Due to the complexity of the parts 2D X-ray images are difficult to interpret and smaller flaws which are typical to AM may be missed .
 concept or principle: complexity; concept or principle: 2D; concept or principle: images; concept or principle: flaws; manufacturing process: AM; material: be
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: complexity; concept or principle: 2D; concept or principle: images; concept or principle: flaws; manufacturing process: AM; material: be