1989
When supports are needed inside a complex part , these supports might not be physically removable at all as shown in the example in 18 .
 application: supports; application: supports; material: be; material: as
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:
 application: supports; application: supports; material: be; material: as